I was told by someone here selling pre-modded ps2's that
version 9 (SCPH 50001) is the best version to modify with the
Matrix Infinity, but I don't believe him. I have to find out soon because he's going to start the mod tonight or tomorrow. I wanted to get a
version 7 (SCPH 39001) which he also has at his store.

Is there any reason why he would think
v9 is better then
v7 when modifying with the
Matrix Infinity?

I checked Matrix Infinity's site and it says their
MX-L2 is compatible with
v1 - v10. Before that version is their
MX-L which only goes up to
v7.
So which is better for the Matrix,
v7 or
v9?