I normally am not very active on this forum but since you asked....
good clearance under the axles (more than a Dana44)
same diameter and spline count of many Dana44 (30 spline)
drop out third member
lots of build up items and lockers
the vast majority of the Toyota axles came with 4.10 gearing (4.30, 4.56, and 4.88 can all be found stock with enough searching)
rear drum brakes are bigger than 11" in the rear (post '85 trucks)
probably not as cheap to find as a pair of Dana44's
all dimensions are metric
the Birfield joints in the front are not as strong as the front axle u-joints
not as many widths to choose from
smaller ring gear diameter (8" vs. 8.75")
I would not swap in Toyota axles under a Jeep (except maybe under a flatty). The rear axles are very similar in strength but the front Birfields on Toyota axles are a weak link. If you were building up a Samurai, I would say go for it but metric axles under a Jeep.....why?