Honestly, I probably dabble too much to really say.
Maybe Fuji Pro 400h, RIP, but mainly just because it's ISO 400 color that's available in 120 and has a convenient stick tab at the end that you don't have to lick. Since that's gone, probably Portra 400 or 800.
In 35mm, I mostly shoot Velvia, but that's for a specific project where I project Velvia slides on naked ladies. When I'm not shooting velvia for that, it's kinda just whatever I have lying around, which is a wild mix of whatever I found for cheap. Today, for instance, I'm shooting some FP4 that I found at a Goodwill Outlet for basically free.