Try them both at the range and pick the one that shoots best.
For what it is worth, I prefer the 160-grain Nosler Partitions.
I shoot a 7mm.STW like stubblejumper does and my rifle shoots 140gr. & 160gr. Nosler Partitions very well. I just prefer to have the larger 160 grain bullet in my rifle.
Either bullet you pick will do the job just fine.
Good Luck