My vote is for Ultimate Droid. Bugless Beast is great if you want a stock look, vanilla Android experience. I have run it with no problems at all. But Ultimate Droid's sheer volume of customization options - which are almost bewildering - wins the day. It's fast, smooth and infinitely customizable to give you a Droid that is uniquely yours. But I too recommend you flash BOTH and give each a few days to settle in... and judge for yourself.