Joe,
We stock both units and we here at store use both units all the time.
The obvious difference is no GPS on Raymarine units,it depends on what you are doing with it.In deep water the Raymarine is a better unit and the display is simply the best on the market in that price range.
The matrix is far easier to use and has alot more features than the Raymarine as it is an integrated GPS/Sounder system.
On the service thing,Humminbird service is the best service around for repairs and warranties however Oceantalk are very good also.
We have very few dramas with either company.
Sundown Marine