wait a minute... its all about the Benjamins!?
you've already answered your ?.
Either one needs gears and lockers so that is not an issue, you're gonna pay one way or another....
and you already have the Toy axle... Use it!
I believe I heard of one busted longfield (on POR) but I know very little about that. I am running one of the early ones since January with a Detroit and of course, not broken it but I'm pretty easy on them compared to others. (Actually, I have a newfield on the long side and longfield on the short side to see which one go first.)
So.... stick with your Toyota axle, run the longfields and don't look back.
take care...