I dont use either... Kinda hard for a pokemon game XD.... But, from what I hear and saw, XAS is said to be much better. I have been here long enough to know that Blizzard is awesome, I can ask him for help and get in within 24 hours, he is supporting no matter what game you make... again fan-made pokemon game (how many have suceeded?) but he still gives all the help he can, he is nice, and is always improving. On the other side, from what I hear, (havnt had personal experience) it is very hard to get into contact with Mog, he dosnt seem to give much help. Also, while XAS is cool, it is laggy. Overall, Blizz ABS is a heck load better.