I own one and have played with the other, both are fine knives. You should play with 'em a bit yourself and decide what you're gonna use 'em for. Buying the Lightfoot for its chisel grind and extra-heavy build might be just the thing for you. Or you, like me, might decide that it's just too heavy for an everyday carry knife, I'd rather have more belly instead of a true spear point, and I'll take a v-grind over a chisel any day; that meant the Terzuola for me, hands down. Heavier isn't necessarily better -- unless what you're after is a heavy knife. They're both well-made, so it's up to you what you want.
Joe
jat@cup.hp.com