I have done a mixed bag hunt just like you are asking 3-4 times and took a .300 WBY on all of them. Obviously, more power than needed but was glad to have a gun I trusted (the most important part) for long, windy shots.
Could I have taken a 270 and had equal results? Probably, but I don't own a 270 that I trust ....
>>> Bottom line, take the gun you are most comfortable with.
I'm in a similar boat but a little diff.
I do have a 270 W I like/trust/& am comfortable using.
I also have a Black Shadow 300 WM that I like/trust & enjoy hunting it TOO.
I would take BOTH and maybe hunt BOTH.
So maybe I'm NO help to the ??
Jerry