Having the luxury of being able to change filters on my Spectrolino, I'm beginning to come around to the opinion that UV filtration is giving me a slightly better overall profile, especially in the neutrals. This really shows up when using the Epson to simulate a pre-press proofer, where the matches are closer than ever. Unfortunately, very few instruments these days have changeable filters, and unless you have a very generous budget, you have to choose one or the other.
If you're considering moving to the ColorBurst RIP one day, having UV cut built in will probably be an advantage for their system, as everything they do is designed with that in mind.