I wasted so much money on bottles with both of mine. My daughter at first would only use Avent and then only wanted a Nuby cup. Due to latch issues with my son he was bottle fed for 3 weeks and would only use Avent. Now he won't take a bottle and will only use a Nuby. Oddly they were both exactly the same.
I agree about holding off if you can. Or registering for only 1 of each. I was grateful for friends who passed on their bottles for me to try. I can see your thinking that if breastfeeding doesn't work you will still need bottles but even formula fed babies have bottle preferences. Most people I know have tried a few, even if it wasn't all rejection from the baby. Sometimes it's as simple as you not being comfortable with the shape to hold or parts to wash.
If you obey all the rules, you miss all the fun. - Katharine Hepburn