Search the forums its on a few sites and will give directions how to install. I been on flyX since it came out with no issues. I then theme they way I like. Some roms like flyX can be dl and installed using rom manager.
like i said, it's personal preference. "better" is subjective.
if you do just a little bit of searching, directions are all over the place on how to install these
Each has its thing and everyone likes something different. flyX is a simple rom that just removed bloat and junk. It's nothing fancy but it works. If you want more mods others have them.
I thought flyx was very stable when I used it. I'm currently using rubix focused 1.0 and think it is def faster, but I have random reboots on occasion. Not enough to stop me from using it tho