Do as your surgeon says
He/she's the one who has the most experience with their own patients.
There isn't really much difference, but it would be better to choose products that have been developed with the bypass patients in mind--the amount your body needs daily is not different from non ops, but some of the absobtion maybe lower, and also, limited food intake can have you lacking in vitamins that we don't need in a large amount, but isn't included much in food either.
Chewables, swallowing make no difference either. It's just that chewables are recommended for those early out because your pouch hasn't recovered yet, but after that, makes no difference.