I thought the ram looking ones were faster, but not enough now to warrant the cost. Though they appear to be good for a wallet size pc.
I feel the more affordable SSD with a plastic case is fast enough for me. I would rather spend more money on a faster CPU and video card, so I can play more games at higher video quality settings like 4K.
The Ram looking SSD are good for those very thin laptops.
a pain to pull data off as they require special cables.
I prefer a clean install of the Operating system, and using a USB hard drive to copy the data back onto a SSD from a USB drive.