if the question were "what are the benefits the blade being handle heavy over blade heavy?", i would have responded differently. im not angry at all, i'm just not willing to let that point go without a fight
as an example of why a blade heavy sword would be better then a handle heavy one - if you look at the thickness' and geometry of katana's, the swords that are meant to go through armor are generally thicker and more obtuse geometry. part of that structure makes it more blade heavy, wich can help carry the momentum of the blade down onto and into your opponent.
jerry has specifically stated that the ak47 was designed to perform best against softer cutting targets, in the rice matt area of hardness, so the geometry is thinner and lighter then something meant to cut through armor.
but the same applies to the thinner geometry, having the weight forward helps the weight and momentum of the sword carry itself through the arc, helping out in keeping the sword going as it cuts through the target. likewise it can help in getting more power out of the cut.
the benefit of having the balance closer to the handle being that the swords pivit point (balance point) is centered closer to or on the front hand, so that turning the sword is easier and faster.
with this set of configurations, aluminum vs. micarta, the differences is only 3-5oz, a difference of no more then 1-2"" worth of balance point shift. i honestly think that to a large degree the difference will be negligable, and very easily counterbalanced by practice and getting used to it. you'll have a preference, but you'll be able to use and get used to both.
i beleive that the difference will be similar to the straight handled battle mistress vs. the ergo battle mistress. they both perform differently in use while woodworking, but they both have their advantages. one is not inherently better then the other, unless you are being more task specific. the straight handled will get heavier cuts, more penetration, the ergo will wear your hand out less, and will have faster and easier snap cuts. i would much prefer the straight handled, but i understand why one would choose the ergo handle.
and there in lies my problem with answering the question. if your asking wich is more optimal for a specific style, i think the answer would be more appropriate. but in general, "martial arts" refering to the swords use against a human target - i think the difference is negligable, and will have little effect once you get used to it. i would prefer the blade heavy weighting, with a lighter full weight.