The only stronger D44 shafts I would consider are Superior Axle's Evolution series which are US made. The others are all pretty much imports and not something I'd knowingly run again. I'm running Alloy USA shafts in the rer which I later learned are imported. I've twisted several D44 axle shafts and my next swap will be to the Evolution from Superior Axle. I might even go 33 spline this next time.
Gone wheeling, back late sunday... Remember that having a different opinion doesn't also require one to be a jerk when expressing it.
I read a thread somewhere which would worry me about this upgrade. I believe this is much more than a direct replacement. I think it requires some additional fabrication. Please do your research before diving in.