I agree with everything that aztimm said. I'd add that unless you're a die hard Dodgers or White Sox fan, the Camelback Ranch Stadium is not that interesting. Yeah it's shiny and new (2nd year in service this past spring) but it's just so so. Scottsdale Stadium is great for people watching as there seems to be an inordinate number of Scottsdaleites strutting around the stadium aimlessly trying to look their best. My favorite park is Peoria where the Padres and Mariners share a facility. Free parking, good freeway access, lots of local restaurants and things around the ballpark.
As spring training gets closer, make sure to check out the Cactus League web page, that usually has some pretty detailed information about schedules, facilities, etc. Also, the Arizona Republic will usually do a pretty in depth review of the stadiums each year so make sure to read up on that also.