Not ever using either before,it looks like the 10.5 recoilless would be more effective against armour with the HEAT at closer range and better at soft targets at long range.
Even though the 7.5 howitzer has 5 AP rounds many would probaly miss or deflect and has fewer HEAT,and we know the 7.5 has little effect on softies.
I'll put my money on the former rather than the latter and save on some buy pt.s
