The PSIO has compatibility issues and is rather slow. Here is a good comparison video: https://www.youtube.com/watch?v=LYs_7V2Xh1k
I own a PSIO myself, bought it years ago and I definitely respect it and the person who created it. But it's been topped for sure. Granted, the XStation is currently sold out, but I see no reason to go with an inferior product.
There is no point in a better product that you can't actually buy.
There is no point in a better product that you can't actually buy.