Just 2nd-ing this.

If you had an option for NVME SSD cards; I would have voted that option, so since you don't, I voted "Other". Since the desktop machine I built recently has an M2 port that supports NVME SSD's, so I bought a NVME SSD card for it. And it's much faster than even a "normal SSD drive" - since it uses the PCIe interface rather than the SATA interface. Well worth the money, as my system takes no more than about 10 seconds to boot, from BIOS handover to OS, to the time I'm at the desktop and ready to launch whatever program I want to use. In all honesty, it probably takes less than 10 seconds to boot from start to finish.

I do also still have my "normal SSD drive", and my "spinning platter" drives for just storage of system backups and my recorded TV and other large video files and similar.

I dare say the OP meant "the drive you have your OS installed on".

Once I realized SSD was more stable and less prone to errors and hardware issues, I've never looked back. I'm only using SSD now. I still have a few large HDD disks for some old stuff, since lots of diskspace on SSD is still not exactly worth it for low value data.

Back then SSD was still very expensive, and people said they were less reliable than HDD. But even my 1st gen SSD disks run fine still, while I have plenty old broken HDD's.

And don't forget more quiet, and less warm.

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I boot Openbsd on the SSD
run legacy Devuan on the HDD
select boot drive from bios, not grub dual boot
large ext2 data partition on the HDD

Presently, it is a micro SDHC card in my RPi400, just for convenience, as it isn't the best option, but so far so good...

(I have back ups.)

Enterprise-level, not consumer-level: WD Ultrastar

Yes, it is hot, but that's solved by a fan attached to it.
Yes, it is slower than a SSD, but I am not rebooting my machine every hour.
But, it is a thing I can rely upon. And it is the only thing that matters to me.
I do value my data, I do value my time, and I do value my peace of mind too. I do not want dependence on a complicated backup scheme over a bunch of unreliable devices; I want my main drive be capable of doing its job on its own.

If there were SLC SSDs, I would gladly buy one of them. But spare me TLC and QLC; a "storage device" that can go poof just from sitting unpowered for some months, corrupt any random thing on a power loss, or become a total loss due to a bug in its overcomplicated firmware, is a toy for somebody else to play with.

Is worth noting that TLC flash is already slower than a HDD when doing writes; so when drive's write cache gets exhausted, by a multi-Gb file such as a Slackware ISO, an "unexpected" huge slowdown suddenly happens. Even when buying a mere USB flash drive, it is worth it to shop for a MLC-based one (while a rare beast these days, Transcend and SanDisk do still make some) to avoid such rude surprises.

Assuming I'm not the only one previously unaware of those terms...

[SMTQ]LC = (single|multi|triple|quad)-level cell - i.e. how many bits of data are stored per memory cell.

https://en.wikipedia.org/wiki/Multi-level_cell

Most of my systems are running SATA drives but there's one still booting from a RAID1 comprised of a couple of old Compaq 36GB/10K disks and another booting from some even older IDE drives (another RAID1 device) with an old Sun desktop disk enclosure full of 36GB/15K drives (RAID5). As part of a housecleaning effort before our most recent move, I got rid of an old Compaq EN system that was using two StorageWorks disk shelves filled with 18GB disks and two Sun enclosures full of the 15Krpm drives with RAID1 devices configured across the two boxes (one of those remains running on that IDE-based system). I have a carton full of SCSI disks that I'll probably keep using as spares for the time being -- the 15K drives are noisy, though, and run very hot (they required an enhanced StorageWorks shelf with dual-speed fans and beefier PS bricks) -- so will primarily only be used in the Sun box where there's sufficient ventilation and soundproofing.

Future plans are to go full NAS storage with solid state boot devices on the Intel- and/or AMD-based systems though I've already replaced some old systems with Raspberry Pis to handle things like Bind, Nginx, etc. functions and may continue in that direction for everything but my primary desktop.

Also penta is now getting ready to be released, as Toshiba, Sandisk and Intel are actively developing it, and at least some are rumored to have working prototypes.

Other: hybrid RAID1 array, consisting of 1 SSD and 2 HDDs marked as write-mostly. Some bad experience in the past with both older HDDs and SSDs made be a bit paranoid I plan to switch to 2 SSDs - 1 HDD soon.

1TB HDD in desktop (Dell Precision T3600)
250 GB SSDs in laptops (Thinkpads T410 & X200, Asus eeepc 1001ha)

SSD for the main drive and software, several HDDs for storage. Linux has been a lot more usable on a mechanical drive than Windows for me but it's still a lot faster on the SSD. Mechanical drives are a lot cheaper per GB so I use them for storing all the other files

"main drive" doesn't make sense because I have two which I use equally. SSD for boot/speed and a very large HDD to store games / pictures / backups.

I understand "main drive" as "o.s. drive".
For instance, my laptop contains one (rotating) hdd that I could eventually replace by a ssd in the future, however I use many other hdds for media storage on a double docking station (in my old pc, now with a mother board problem , I had 6 hdds plus 6 or 7 other external hdds through usb and firewire connections.