With DC1 I used the classic Avent bottles (that's all they did then) but saw some new type in the shop the other day. Did not like Tommee Tippee because it seemed like the milk spilled out of them very fast, too fast, but they too seem to have an updated version. MAM were ok but a bit faffy with all the parts.
Only after some opinions as can't make up my own mind!
My Advent classic bottles were perfect. Still using them now that all the bf'ing is finished. Got an amazing deal on Amazon for 2 small bottles, 2 big bottles, 2 dummies and a bottle brush. It was about the same cost as 2 large bottles usually cost.
I used Avent mam and then Dr. browns for DS, for this one I've just bought 2 of each tommee tippee, Avent, dr browns, and mam in case the dreaded colic happens in this one too. Will buy more of whichever suits her best. With DS someone would recommend a brand and I'd rush out and buy six only for him not to get on with them and be a waste so much trial and error with little ones! X
I used mam ones for dc1 and will use again for dc2 (though we will get new ones as not convinced the rubber seals would have lasted). I like the fact they come apart for proper cleaning. We had a few dr brown ones which were leaky.