I bought 1 of every brand to try out first... And see which my boy prefers. So far I tried Avent, NUK, Pigeon and BFree. There's another brand Tommee Tippee which looks pretty good.
My boy prefers Avent. He doesn't drink alot at a go so up till now he is 17 mths, he still uses the small bottle.
It really depends on your baby.