Donout (1.6) please forgot it, its old and incompatible woth tweaks and with a lot apps
Eclair (2.1) use it if you want, but it has less features than Froyo
Froyo (2.2) - Developers had more time to upgrade it, so it can be better (cause started before gb)
Gingerbread (2.3.0-2.3.7) - it has better custamization than froyo, and has more tweaks to it (for ex. Adreno libs)
Honeycomb - (3.0) it isnt for phones, its only for tablets
Ice Cream Sandwich - (4.0.0-4.0.4)
Wait for it! Sign the petitions to get a fully working system of ICS
So
Older - Faster, Less Compatible with apps, has less tweaks, less customization, better battery life (1.0-2.2)
Gingerbread - Bit slower, Most apps are compatible, has more tweaks, more customization, less battery life (2.3-2.3.7)
Newer - A lot slower, Some apps are not compatible yet (~50%), have only a few tweaks, BEST customization, Battetylife is as GB's (3.0-4.0.4)
I preffer GB now

PrimeHD 8.0
Hope i helped
If you want to give me the first thanks in my life, do it
