According to my sister, you never know what type of bottles your baby will prefer. She suggested I register for a bunch of different brands to test out which would work. We only got a starter set of Tommee Tippee and our baby took to it pretty well. I breastfeed so we haven't had to need additional bottles beyond those already in the starter kit.

My sister, on the other hand used Playtex DropIns for one of her kids and Avent with the others.

I almost went out and bought faster flowing nipples when our little one got older, but I was told to keep him at the slow flow since I was still breastfeeding.