Same here, I'm personally in favor with clean looking dash layout in the Yaris, but the Fit's dash looks rich. In fact, a friend of mine who drives a new Accord prefers the Fit's dash over her Accord.
One thing I totally dislike about the Yaris's in-dash system is No AUX port for an MP3 Player and paying over $300 for an iPod adapter is ridiculous when everyone else is offering it for free. It's not going to cost the manufacture that much more to offer a stereo system with AUX-in port. So why leave it out? My old Civic had an Alpine system with an iPod adapter and now with the New Yaris, the iPod is collecting dust on the dresser and I'm listening to AM/FM for my music. How primitive. But on the bright side, I'm working on getting a 2 din DVD player with iPod adapter which should also add some 'richness' to the centre dash's appearance.