Look at what you are getting before you buy. Years ago I bought a Garmin QUEST. It was a bit complicated to operate for a codger like me but the Missus and I soon learned to make it work for us. It is still great.
Son-in-law got me a NUVI for my birthday last year. It has the large screen but is much more inaccurate than the old QUEST with the tiny screen.
Example, the Nuvi is looking for Pizza Hut. I can see the joint straight ahead past the red-light. The Nuvi say go left, then left then right, leaving you in the back lot of a large log yard.
One good thing the NUVI costs about $400 less than the Quest.
Caddis
If you can get a decent signal it will put you right on a small target.