With that kind of energy to be honest it doesn't matter. Both will be overkill for deer and most other animals in the states. I ran both arrows and the numbers are very close for both KE and momentum, and trajectory is fairly close at normal ranges as well.

As far as heavier arrows being quieter or having less shock, well at one time I would say that were true. Or if you were shooting a cheap or old bow. However with the newer bows and stuff we put on them I don't think it matters much. And that really isn't a super light arrow anyway. My bow will shoot arrows that weigh under 300 grns just as shock free and quiet as arrows that weight 500 grns. However I shoot a bowtech Mighty Might VFT that looks like a simms advertisement. If I did the same thing on my 2000 darton yukon stripped down it would make a difference, but I honestly don't think a huge difference.

I would go with the arrow that spines best and shoots the best out of your set up. In the end that will be the most important thing.

Paul