Came from IOS, now Android. MIUI US rom and CM7 So far MIUI is a lot smoother but has problems with GPS and Network. CM7 Not as smooth, but best overall.
sorry for my english it`s not the best.
after a long time, of reading tutorials and much brick`s of my htc hd2 Leo (T-Mobile). and test for various roms and way`s now im happy. i have Hyperdroid GBXv12 running as clk.
Please give your vote based on your actual OS on your device and not the one you wish to have or think it´s the best.
If you have more than 1 device vote for the one you most frequently use.