Which is stronger, the T98, or the NP435?

I have both and both will need some fabricating to get into my truck, but either will work. Now I have to decide which is better. I know both were used in upto 1 ton pickups, but which is the better choice?

 

Are you sure your T-98 isn't a T-18, as some T-18's were put out with T-98 marked top covers I remeber reading some years back. Even so, they are about the same between T-98 and T-18. Generally, until the 1980's models, the T-98 and T-18 models were used for 2wd's and 435's for 4wd's in both F-100's and F-250's. (not counting 1979 when the F-350 4wd appeared)