I would wait for the better light.
4 t-5s on a 55g should be fine, if they're in a fixture with individual reflectors then that's all the better and more than adequate for BTAs.
Since 4x54=216, would 6x32=192 be comparable for lighting a 55g 16 inches deep max for a BTA?
Since 4x54=216, would 6x32=192 be comparable for lighting a 55g 16 inches deep max for a BTA?
As long as the fixtures were comparable, equal wattage should give about the same light. Different technologies (PC vs T5HO) and different reflectors will give very different results for the same wattage.