Since this is a fresh start for us all, I wanted to get into the Blast Bombs.
According to the Wiki though, Irontech Destroyer level 10 ends up with more attack power than a Nitronome at level 10, but at somewhat slower speeds.
And Big Angry Bomb seems to totally be out of the question.
And barring the fact that Irontech series needs Trojan Horseshoes and Kozma sells the Nitronome series recipes, which one seems more practical to use in actual combat, and is Irontech worth more effort to find and create?
I had the Irontech Destroyer and the Nitrnonome I suggest the Nitro the Irontech is basically like the Gravitation Vortex (in the sense of walking speed) the blast is big and looks cool, and does a bit more damage, but the slowness is a HUGE NEGATIVE. If I was you go for the Nitro its easily better.