Well, the standard answer will be "Which ever your 45 shoots best". I've never shot SASS/Wild Bunch, but have shot a lot of matches (USPSA, Speed Steel. Bowling Pin, Bullseye, Silhouette), with my 45's. I have found, if the targets are made of paper and the ranges are short I would use the 200gr. LSW's, but if the ranges are longer and the targets are of steel, I would use LRN 230gr. This assumes of course, that each bullet will feed in your 45's, and your reloads are good.
This is just MOI...
By the way, is there a Power Factor you have to meet?