Build rpm 'better'? Faster is the key word. Generally speaking, from a physics stand point (object in motion, etc.) a short stroke has the potential to reach max rpm quicker than a long stroke. Of course many other factors come into play as well, but it's hard to beat 'physics'!
Take two engines identical in every way, EXCEPT one is small bore long stroke, the other BIG bore. I'll put my money on the short stroke based motor everytime.
You really see this principle at work on small motors, like motorcycle engines. Generally speaking (again) there ALL big bore short stroke machines.
Some of the great motors of 'yesteryear' were square. I believe the Chevy 283 V8 was such a motor.