It's not really a waste of time, it's good that you share your thoughts so that we can either convince you to go for X10 or go with X9.
Personally, I like X9 better, because it's technically more polished. It's hard to explain, but the experience is much smoother. Less bugs. But, if you want allies, X10 is the better of the two so far. X9 will get allies eventually though.
Although X10 is slightly more buggy, it has more polished physics, a timer-based engine, a good AI-system, and overall prettier graphics. You can accomplish some very nice results with X10, and if you learn to avoid or get around some of the more common bugs, it's tons of fun to play with.
Your big has been erased by a signature because it was too mod.