Here are the factors that matter most to me...
Nipple shape - I wanted something that was closes to a natural breast so my babies could maintain their ability to nurse.
Back-suck - I'm sure there is a fancy scientific name, but I mean that when a you suck on something without a pressure release, you have to break your latch to let the pressure equalize. Most of the bottles on the market try to address this problem, but I found that only a few were successful.
Comfort - that is, comfort for ME while I hold the bottle for an entire feeding session!
Cost - if you are buying an entire bottle supply, you want something that works well for the price!
Everyone has different needs, but hopefully I can give you a little more information about what each bottle has to offer.
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Avent bottles are my favorites. This is because the nipple is closest to a natural breast shape, I like the shape of the bottle, and it's comfortable to hold in the 4-ounce size. The 8-ounce is a little bulky. Now that I nurse Oso exclusively, these are my favorite bottles to use. They have an airflow mechanism built into the nipple that is supposed to solve the back-suck problem, but it doesn't work very well and I usually have to break the baby's latch every once in a while.
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Playtex bottles are great. They are bottle frames that you purchase liners for. The liners were far and away the best solution to back-suck, because they collapsed as the volume decreased. I've only used the strait bottles (crooked-shaped bottles confuse me!). The nipples are decent, and the bottle shape is comfortable. The biggest con is the ongoing cost of these bottles - after buying the bottle, you still have to pay for bottle liners on a regular basis. I loved these bottles for traveling, because I could bring a bunch of clean nipples and liners, and use just one bottle. It saves major bottle cleaning hassle.
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Basically, when I bottle-fed Mono, we used mostly Gerber or Parents Choice bottles. When we traveled, I took my Playtex bottles and bought a box of liners. Now that I am nursing Oso, I use Avent when I need to give him a bottle every now and then.
Do you nurse or bottle-feed? What is your favorite bottle brand?