Playing the upright is a full time focus. It's great for your electric bass playing to play the upright. It raises your level of strength. The problem is that the scaling is different. Switching back and forth takes a moment to adjust.
Cats are usually either great on one or the other, except the very few that are great on both.
One of the reasons I was hired with Spyro Gyra was that I played the upright. So on their shows I would play three tunes on the upright bass and the rest on the electric. That was good because it kept my chops up. That's an opportune situation where you can play both instruments on a gig. There's going to be a couple of tunes on the new Rippingtons record, which is entitled Brave New World, and they will have upright on them.