When im targeting Bluefin,Yellowfin tuna...i use a underarm short/pitch style. Center weighted jigs work best for tuna's, allowing the jig to flutter on the down strock. A slow to moderate speed works best with these jigs.
When im targeting AJ'S, Blackfin Tuna, Wahoo...i'll use both styles and both work well, but i'll use the underarm short/pitch for most of the day. Tail weighted jigs work best... jigs dont need to flutter, they just need to move fast.