Good afternoon,
The Toyota Matrix is a new model and therefore has no track record in reliability other than its Toyota name. If you like the looks, which I find appalling, then you may find it worth the gamble.
Since the first Nissan Sentra SE-R back in the early 1990s, year after year it's been a favorite of every major automotive publication as the best bang-for-buck (inexpensive) sporty car available.
It comes down to this: do you have the cash; which looks do you prefer; test drive them extensively and which is the better drive.
Good luck,
PCM
P.S. - With your alias of SUBxWRX, why aren't you buying the Subaru Impreza WRX!!!