Your question is, of course, silly. That is, you know and we know that either gun will be entirely satisfactory under the conditions you describe. So . . . the decision is a matter of personal inclination and whim, almost. Now I'm not disparaging or mocking you! I relate to your question quite well. I can go deer hunting with any of my .25-06, .243, and .30-06 -- any of which are entirely satisfactory for my hunting of smallish Oklahoma deer (none of my three deer to date have field dressed over 100 LBS). So I decide what gun to take on personal, almost whimsical grounds. I took my .243 deer hunting last year because I hadn't taken a deer with it yet. I'm taking my .30-06 this year because I have not taken a deer with it and because I hope to use it on a cow elk hunt next year. I could just as readily have decided to use the .25-06. I might choose to use one of these guns simply because it was the one which has been most "neglected" and left sitting lonely in the gun cabinet while the other rifles have been out seeing action. Silly.

Anyway, given the circumstances you describe, if it were me I would take the .270 because you haven't used it to take game yet.