Hi Bulldog; I shoot GT Trad Hunters 1535's, full 30" from my 45# Bear Super Kodiak recurve, off-the-shelf at 27". With a 125gr point my numbers match up well with Stu's calculator and fly very well, but many would argue my arrows are pretty light at just under 400 grains (I certainly wouldn't go after an elk or a huge hog with them). As far as which of your arrow setups would shoot better and why, I see it this way. Both will fly reasonably well. The lighter setup will fly flatter, faster and farther but hit less hard. The heavier setup will drop more after 20 yards or so, fly slower, but hit with more impact. So if you are confident you can get a good shot at closer range, say inside 17-18 yards, the heavier setup should be better. If you want better accuracy at longer range, use the lighter setup. Either way, make sure you come to full draw and have seriously sharp broadheads--you will need both.
Cheers,
Brett