I have both a Cort C4 and a RBX375. I love the C4, the bass itself and all hardware has a lot higher quality feel than the Yamaha, and it sounds really good stock. It's my go-to bass for RHCP songs. I'd vote for the Cort C4.
The Yamaha is ok, but the only reason I keep it is because it's the cheapest ok quality 5-string with 18mm+ string spacing that I could find in the area. I hated the preamp in it, sounded really muddy, so I removed all the electronics except the pickups and made a new passive setup. I've read several people on here has done the same and converted it to passive.