Well, being a newer engine means it uses newer functionalities of Ruby for scripting, HOWEVER, the flip side to that is that there are far less scripts out there for Ace, than there are for XP. Another thing to consider is your support system. Seeing as though you're on a board where the majority of everything is XP (well, I know we're slowly moving away from that with some of the scripters here, but I have yet to see Blizz ABS for Ace =P ), you may want to think about it this way; you say you're new to the program, which is fine, but, you will probably get better support, and more support for that matter, with XP. There are more scripts to use and edit, and people are still developing for XP even now. I have not used Ace yet, so I cannot say if it is better in any way that relates to the UI, but I'm sure they have improved at least something about it... I hope... Although, it is Enterbrain we're talking about, and since they JUST fixed the "free" program registry hack.... lolz...