All cories are fab,but i know what you mean,well between my cories,(pandas,trilineatus,skunks,albino & pygmys)i would say the pandas & albinos are the most active,especially in playfulness,always on the go
The tri's are the first cories i got and they are fab,especially giving me youngsters,although they don't lay many eggs,they have been consistant since last september,they have slowed down now(probably wore themselves out
) The skunks are plodders,often seen sifting through the sand,they love digging holes in the sand
So it depends what you like really,if you're after cories to breed then i would say bronze or albinos,these seem regular and large spawners when they get going... and are relatively cheap compared to Trilineatus...