One filmstock for life

If you had to choose one filmstock for life, which would it be? And why?
You can't switch it out, ever. You can only use that. If you use medium format too you have to use the same one there as well (if applicable). Price should be a consideration but shouldn't be the reason why you'd pick something soely by that.

Eventhough I shoot more B&W film I would have to choose Portra 800. It isn't the best in anything to be fair, but for me the most versatile option for my everyday shooting.