The best answer is... the one your baby likes. I know, I know, not what you're looking for when creating a baby registry or worrying about nipple confusion. I did some checking around and according to onsumersearch.com the bottles below are what other moms are rating as the best bottle in each specific category.
Best Plastic Bottle: BornFree BPA-Free Bottle
Best Bottle with Disposable Liner: Playtex BPA-Free Drop-Ins Premium Nurser
Best Breastfeeding Friendly Bottle: Adiri Natural Nurser
Best for Colicky Babies: Dr. Brown's Natural Flow
Best Glass Bottle: Wee-Go Glass Bottles
Personally, my favorite bottles were the wide (not standard) playtex drop-ins and avent bottles. I tried numerous bottles including all of the listed winners except Adiri Natural Nurser and Wee-Go - sometimes for research and sometimes for baby needs (reducing spit-up/gas) and there is a difference and babies do have a preference.
Lately I've even seen the insulated bottles (think like a travel coffee mug). Those sound interesting - if anyone's tried some I'd love to hear your review. I think I'll order some and try them out for our followers.
Whatever you pick for a baby bottle - make sure its BPA free!
click here to read the complete consumer search review