For where you're going and what you're doing, between the two,
---- 300WSM ---- hands down.

Bigger guns can be loaded down to little gun levels.
Little guns are always little guns.

Since "recoil sensitivity" [:'(][:'(][:'(]is not one of your problems, then it is non-issue.
Besides Short Mags are supposed to "magically" kick less.

Personally, I prefer something that is frisky and lets me know it is there and dishes out a "world of hurt" on the business end.

EKM