WD Blue SN550 for example comes with QLC NAND chips - along with a DRAMless controller, the current price is actually more than what you get in my opinion. Can be really slow in some situations. I would rather get a SATA TLC drive with DRAM over SN550 or Crucial P2.
I think PCIE 4 drives are overpriced as well, for what you get over PCIE 3 drives.
I personally value SSDs in this order (again, this is my personal, uneducated silly preference)
MLC PCIE3 > TLC PCIE4 wDRAM > TLC PCIE3 wDRAM > TLC PCIE4 DRAMless > TLC PCIE3 DRAMless = TLC SATA wDRAM > all the DRAMless SATA and/or QLC NAND drives...
Not sure where to put MLC SATA drives, then there are planar and 3D MLC NANDs (I have a SM883 1.92 drive and a Samsung 830 fantastic snappy, peaceofmind, workhorse drives. Love them.) tempted to say they are on par with PCIE4 drives but I chose to pretend there is no such thing as MLC SATA drives...
I think TLC PCIE3 wDRAM drives are at the performance/price ratio sweet spot right now.