I'd want to know the spring perch width on that 44. If they kept it at the Waggy width, then your tires will likely hit the springs at full turn if you run 35's or larger. Part of that is because the 44 turns sharper though. Hopefully they set it up for Toy perch width even though its a little more work.

As for the rest- building a 44 costs about the same as a Toy axle, so you can take your pick.

Stock D44 axles/joints are stronger than stock birfields, but chromo Toy birfs are cheaper and might be stronger than chromo 44 shafts/joints. The D44 diff may be stronger than a Toy 8".

The Toy axle will be nearly a bolt-in with all the SAS & steering kits out there for it. The 44 is a more custom and requires you or your installer knows what they're doing. The 44 also has big calipers, and will likely require a master cylinder mod (the end result may be stronger brakes though).

My SAS page has a lot of D44 swap info if you're interested (and some of the info in this thread is wrong and/or irrelevant). Overall, the Toy axle is a lot simpler, but not necessarily better.