Hi Dean,
These systems really aren't apples to apples at all....I represent both of them, and can tell you a LOT of differences between the two of them - they really are quite different systems. I would take the advice of looking at them in person at OSH, and also some of the other vendors out there.
Contact me off list if you'd like and I'd be happy to help you out on the comparisions...we've installed both of them (just delivered an BMA panel to an RV-9A builder today and a Dual Screen Chelton panel to an RV10 Driver last week).
Anyway, shopping by price isn't necessarily the best idea - of course you have a budget to stick to, but there is a lot of functional differences between systems and wading through the mass of marketing from all the EFIS companies can be overwhelming.
Well, I know my post isn't overly helpfull but before I recommended one over the other I'd really need to know a lot of other info like what you else you plan on putting in the panel, how you plan on flying the plane, where you plan on flying the plane, IFR vs. VFR, radio stack, Engine Monitor, Autopilot, GPS, Etc... all of those things can have an impact on what EFIS works best. Some EFIS's don't play nicely with certain pieces of avionics, gps's, autopilots, etc...and some do!
Cheers,
Stein.