If you're using a modern NVMe SSD you can simply ignore the presence or lack of a DRAM cache. Modern PCIe devices can use Host Memory Buffer to let the CPU map part of your RAM as the cache, and because with PCIe the CPU is the one accessing the SSD directly anyway, the cost in latency is minimal. The end result is that if you do an extremely heavy I/O benchmark you can indeed measure the difference, but if you're loading programs, saving files, playing games and whatever else, it really doesn't matter.

For SATA SSDs the difference is way more significant, but then again, if you're just restoring old laptops a DRAM-less SATA SSD will be so much faster at responding to each request compared to those little laptop HDDs that the upgrade will be more than worth it anyway, and spending extra for a DRAM cache might not be worth the machine you're dealing with. The end result will likely be that your file write speeds won't be super impressive, but your read speeds and latency will be great, so for most purposes it will behave like any SSD and give you the same benefits.

As it was already commented Host Memory Buffer can to some degree replace the DRAM cache (if the SSD supports it and even then the implementation can be bad). But the specification is from 2014 so unlikely that Laptops from up to 2015 will support it.

When there is no DRAM cache on the SSD, the SSD will use the NAND flash cells as cache. This results in more wear and a shorter lifetime. Also, when the SSD gets filled up, the SSD gets significantly slower since there will be less free NAND cells to use as Cache.

In most cases, DRAM-less makes little difference for the average user. The biggest difference is for very large transfers, like copying large games between drives. Either way, it's an easy 3-to-5 times performance upgrade compared to an HDD.

So, according to most answers. A DRAM-less SSD would do for me. Thanks!