Trying to read between the lines here but I take it that you will not be processing and printing your own or at least not attempting optical printing. If so then a good mini-lab will handle a hybrid process which is what it will have to be if you use slide film.
Unless you have the time and enthusiasm to learn accurate metering with a spot meter then I'd bracket with slide film. I'd especially bracket if you see a great shot that may not be easily repeatable. A few "wasted" frames is a small price to pay to get the right exposure.