I used avent ones. I liked them. they were the ones my sister recommended. She used to be the OT feeding specialist for kids under 6. So she has tested a lot of what is out there.
Ive always used dr Brown's n they worked great with my kids n if i can't breastfeed this one then ill use the same but they r a pain to wash.
I hate dr browns. All the parts you have to put together and the extra pieces to clean and make sure they are actually getting clean with all the little holes and they are supposed to help with gas and stuff but my baby still h as gas even with them. It all depends on your baby too. I wouldn't buy too many of the same kind because even if that's what you want to use doesn't mean that's what your baby will like. My daughter loves the mam bottles.
I was using Dr Browns with my first and ended up hating them because there are several parts and I always forgot to make sure to take them apart before putting in bottle warmer. They explode out in bottle warmer! Lol I heard Tommy tippee (not sure how spelled) were good though from friends