"Our household has two entry-level GPS units: A TomTom One, Third Edition and the Garmin NUVI 200. The performance of both units is very, very good. The Garmin is EASIER TO USE, with better MENUS than the TomTom. The TomTom, on the other hand, has more features - although they're not entirely useful. For example, it has an SD Memory card slot - you can use the TomTom as a picture viiewer, which is "neat", but is it useful? Also, you can store your own maps. But, WHY would anyone do that?
So, it's a toss-of-the-coin; something you have to decide yourself.
HOWEVER: TomTom has wisely chosen to make the ONE their "loss leader". That is, because of all the other discount, "upstart" brands, TomTom has lowered the price on the ONE. You can typically find it for FIFTY DOLLARS LESS than the Garmin, which makes it a pretty easy choice.
If the price between the two was identical, I would buy the Garmin. So, if $50 bucks isn't a lot of money for you, then you might want to pick the Garmin as well for its comparative ease-of-use!"