Joshua requires initiative (LOL, good luck) and has only a few good enhancements to play off of him (Zeal [much better on Phineas] and Jordan Interrupted + T-Blast/HolyUntoTheLord). Considering most blocks these days are suicide blocks, Joshua doesn't do much. Ahimaaz is a tabernacle priest, can be banded to by all of the II Samuel/I Chronicles peeps, can be used in combination with Chariots, is protected from capture, can hold Phineas' Spear, can use Zadok Anoints Solomon, and you get to see your opponent's hand. Ahimaawesome.