I’d have to say Sisko is likely the better cook. As far as we know he has more years of culinary experience. Moreover, even though his background is Creole cuisine, he likely has access to more recipes from other species not known or allied with during Pike’s tenure in Starfleet.
On the other hand, Pike seems to recreate and even improve upon foreign dishes quite skillfully. If Pike had the knowledge and access to ingredients available during the DS9 era, it is likely he could masterfully prepare dishes with possibly less effort than Sisko. (Maybe?)
Put them on an episode of Chopped with Neelix and (Sisko’s dad, Singing Klingon Chef, [insert culinary challenger here]). I would totally watch it.
After you watch The Trouble with Tribbles follow it up with DS9 - Trials and Tribble-ations!