Most likely Andor, which I think is definitely a better show, but it kind of depends on what you're looking for. If you want fun, straightforward action/adventure, you might prefer The Mandalorian. If you was a slower-paced but ultimately more complex and rewarding show, go with Andor.

However I would say that while Season 1 of The Mandalorian wouldn't really be hurt by not being a Star Wars fan, Season 2 (and presumably the forthcoming Season 3), are much more tied into pre-existing Star Wars characters and lore. I still wouldn't say you have to be a super familiar with Star Wars to enjoy the show, but it definitely caters to fans in a way that Andor has almost zero interest in doing.