I can't help you there, Cindy. Gab has only ever had avent bottles (apart from in hospital) and we haven't had any major issues with them.
I would agree with Linda tho - maybe the teats she is having aren't fast enough for her?
It can take a bit of practice with something new, too. Maybe try to avoid chopping and changing too much for about a week. Offer the teat that she has drunk the best out of so far and see how she goes. Maybe even offer it after a BF so that you know it's ok if she doesn't get much in (so it doesn't constitute her actual feed - just practice?).