Honestly, all of these are unknown and not the best, nor even secure at all.
For an exchange to be good it must have certain traits such as security protocols, good volume, or maybe even regulation?
Here are the most secure exchanges I found in a list -
https://bitcoinbuyersguide.com/secure-exchangesI think we should stop giving attention to these unknown exchanges as they're most likely off the shelf solutions or white labeled ones that might disappear overnight.