Depends on the guitar; I've got a lot of both.
Right now one of my top guitars is a Schecter Shaun Morgan that has been refinished in metallic purple with white Viper-style racing stripes. Another of my favourites, at least for playing live, is an Epiphone Les Paul Chameleon which runs from metallic blue to green to pink depending on what angle you look at it and how the lights are hitting it. One of my most recent builds is a Telecaster Deluxe fashioned after my favourite comic book character, Power Girl: pearl white, blue and gold. On the slate to finish next are an LP DC Special in a metallic pale lavender and a Tele in metallic pewter. I also have my eye on an SG Goddess in Sky Burst, which is basically a bright white-to-blue fade with matching pickups that have clear bobbins and blue-dyed coil wire.
On the other hand, I've got a carved-top Tele in cherry burst, a couple of LPs in Iced Tea burst, a couple of LPs in the white&gold 'Custom' style, an LP Jr in vintage burst, an LP DC Special in faded TV Yellow, a LP Vixen also in faded TV Yellow, a simply clear coated rosewood-body Tele, a '69 Thinline in slightly-yellowed (not quite butterscotch) blonde, a worn vintage burst 335, an all-maple Kramer just clear coated, and a sort of Jazzmaster in a heavily worn surf green so it looks like a beach hut that's been worn by decades of salt air and sand.
... Then I've got guitars that don't fit into either camp. Tiger stripes aren't common on either cars or furniture, but I've got an LP with 'em. Is plain white & chrome a 'car' finish or a 'furniture' finish? How many chairs or tables have you seen finished in a yellow-red-black sunburst, really?
Gimmie bare wood, gimmie neon pink with blue flake sparkles, gimmie an all-black goth machine. As long as the looks tie in with the feel and sound of the instrument, it's all good to me. Don't give me a 60s Strat with a dripping blood decal and don't give me an Ibanez JEM in a faded Ford Fiesta red, but swap the two over and sure, both are fine.