u/no_solution_no_prob

I know I'm limiting my options, but that's what I'm being gifted.
Traveler Profile:
Trip durations: 5 days domestic US; 7-10 days International
Number of trips per year: 3-5 domestic; 1-2 International
Prefer carry on, but... If I have to check in a bag, its free (no bag fee).

Please help me decide: 70 vs 55
Thanks!