I see. Some people think that X5 is a downgrade version of V.2. It's true if judged by the number of chips supported.
In my opinion. I do not want to pay more for playing games I never paid attention to it (Starfox, Majohng thing, ...). I'm glad the game I like is not on the forbidden list. Although there are some games that do not play But it was only a few bucks if I want (Super Mario Kart is just around $8 for a complete box version). Some of them I'm already have it's box version in my collection (Kirby, RockmanX3...).
Super Everdrive v.2 (with DSP support) is my best choice but In this situation, I chose X5.