Not Ranked
I'd guess the in are radial. That is weight (oz) in regarding to distance from rotating centre. Have never given it much thought- all I know is that the crank gotta match the fleewheel which gotta match the balancer. Then the whole assembly need balancing after a rebuild for performance...
Read up on physics would be a starting point. I'm sure you'll find some clues if you do a googlesearch as well.
Most high- end builds, and practically all racing builds, rely on a internal 0 balance crank. It has alot of + sides, but also some -'s.
However, I see no problem using a external balanced crank in a "hot" build...
Regards
RS
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