I just noticed I had unknowingly purchased different spare tubes. The tires are 26x1.50 Bontranger H2's used 100% for 'round town riding.
I have some spare tubes spec'd for use on 1.0 - 1.5, and others spec'd 1.5 - 2.0.

I'm wondering which would be the better tube choice, in general. There's just a little more material on the larger tube,I would expect. If reducing probability of flats is the goal, which is the better choice? Or doesn't matter much?