440 Automatic. What gears are you running?

Im using 3.73s with 275 60r/15s and it's awesome! Even better when i swap a shorter tire.
So, if I read this correctly, you like the 3.73 better with the shorter tire than the 28" tire. Since I'm staying with the same 28" tire size as you referenced would you recommend going with the 3.91? I'm assuming you already tried the 3.73 with a shorter tire and liked it better than the 3.73 with the 275/60-R15. Yes?