35x13.50R15 or 35x10R15 tires

Slightly more likely, but that shouldn't be a decision maker. If you're wheeling trails where you might flop, you probably want 12.5" tires.

It's a trade off either way. Either better for rocks with a wider tire, or better for street with a narrow tire.
agreeded with the wider tire. another thing when you air down its even wider. wider is better in my opinion. even if I go with the 13.5 ill be good .
 
Slightly more likely, but that shouldn't be a decision maker. If you're wheeling trails where you might flop, you probably want 12.5" tires.

It's a trade off either way. Either better for rocks with a wider tire, or better for street with a narrow tire.
Thanks for the info. what would be the ideal backspacing for the 35x13.50 on a 15 inch rim?