

The SLC, MLC... you mention are another of the details to look, for sure. But I use to avoid entering in such deep details for regular users. Funny thing is those technologies, that are the main responsible of the memory chips price drop, are also the responsible that some of the actual SSD are worse than first ones (it's like the technology evolution in reverse). But they do it because it has sense, because regular applications for those disks doesn't require so much performance as a good SLC SSD can deliver and people use to need a good capacity at a fair price over that extra performance.
Simplifying a lot, anybody purchasing a computer on 2020 that comes with an HDD as main drive is being scammed; by the vendor or by itself. So big is the difference that HDD should already be a niche piece of hardware for very specific needs rarely found on domestic computers. But beyond the DRAM presence or not, the possibility of NVMe ones if your computer is modern and avoiding shady companies with floored prices, the regular user should not heat up their brain searching the perfect SSD.
Regards