best formula

My baby is EBF. But right now I am having to change her to formula while I am taking pain medication and going to have surgery. I have been using a sample can of Similac Sensitive, and she seems to do well. But I also have a sample can of Similac Advance. My question is, should I just keep using the Sensitive? Or use the Advance too? Or are there any other formulas you guys recommend? She will be going back to breastmilk as soon as I'm free and clear of all medication!