You obviously don't know what you're talking about.
The 29 spline 8.25 is a good stout axle that would handle his 33's very well. An 8.25 would also be a direct swap, no welding, measureing, setting pinion angle....yada, yada, yada. If you're lucky enough and your pockets are deep, you might be able to score a D44 that came out of an XJ. It too, obviously, would also be a direct swap. The 8.8 is also a great choice however, it would take alot more effort to make it work.
The D44 and 8.8 are arguably close in strength. Each having it's strengths and weaknesses in diffferent areas. Behind those two, the 29 spline 8.25 would be a close third.