Whichever baby will take :)
Ideally it would be a wide slow flow nipple.
Bottles should only be given in moms absence. No more then 1oz per hr of seperation in bottles no larger then 3oz. And after baby is 4-6 weeks.
Check out kellymom.com for how to bottle feed a breastfed baby. I believe it's stop and burp every 1oz.
Bottles are much of a muchness. All carry equal risk of nipple preference, beacuse that's something attached to the baby rather than a bottle. A baby prone to preference will get it with all bottles. A baby not prone will not get it no matter what you use.
Buy ONE of the bottle you want to try. Hand it to dad the first time you need to go out. Leave. Let dad have at it. YOU cannot be a part of the process. Bottles are generally refused if mom is present.