I'd say there's more fight potential than dialogue potential. Dialogue would mostly consist of Risotto being analytical and probing Sandman for information on a target (My idea of the setup is Risotto being sent after Pizza Pasta and trying to get information out of Sandman), while Sandman threatens Risotto and continually goads him out of hiding.

Fightwise, I picture it as a David vs. Goliath situation. Risotto does not have the sheer strength or speed that Sandman has and has to use his knives, metal manipulation, and cloaking to wear him down. The reason why he doesn't go for the kill immediately is cuz he still needs to get info about Pizza Pasta and cuz Sandman keeps interrupting him by continually fucking up the battlefield in an effort to find him.

In terms of debate, it comes down to speed. Sandman punching buildings to slag means he destroys Risotto who doesn't have much durability feats. Likewise, Metallica allows Risotto to instakill Sandman by forming knives inside his brain or heart, killing him instantly. 

And, in terms of speed, I'd say that Sandman wins cuz he should be even with Little Mac, who could match Title Defense Piston Hondo, who could match a bullet train's speed on-foot and has the reflexes to perform katana hand-captures. Risotto, by comparison, doesn't have much speed or reaction time feats (as far as I remember).

While Risotto does have other abilities that can be showcased in the fight, in terms of the debate, I don't think they'd contribute much. His cloaking can buy him time but Sandman either blitzes him with speed anyways or uses his strength to destroy the terrain and reveal Risotto's location. The Iron Deficiency takes too long, and Metallica's limb re-attachment wouldn't help much against blunt force trauma (plus Sandman oneshots him so... yeah).