if you wanna get technical, short acting esters are more potent. a short ester weighs less per molecule, for example,
test prop 100mg prop is 80mg free test
enanthate 100mg enan is 70-71mg free test
once you cleave the ester off your left with the parent drug, minus the ester weight.
but that doesnt mean prop will necessarily give you more lean mass gains, that i dont know, it would seem to me the shorter ester would.