Hi all. New to biking (after about 30 years). Am riding about 12-15 miles roundtrip and looking for a new bike. I am riding about 2 miles on a paved surface and the rest on a sort of packed dirt/pea gravel type wooded trail. My old huffy does just fine but am looking at a Specialized Globe Carmel - I really like it but not sure which model is best for what I am doing. They make the Carmel 1 with fatter tires and then there is the Carmel 700c with the thinner, bigger tires. Bike store guy says he thinks the fatter tires would be better but I see that Specialized also sells a Crosstail Hybrid with 700c's. If a hybrid has 700c's then why would the fatter tires be better? Will they grip and hold the surface better? What would the 700c's do on that type surface? Will they be smoother, a bit quicker and less heavy. Just really confused over which bike to get (the spouse and I are both getting the Carmel but just not sure which model is best suited for us). Can anyone offer some input? I would really appreciate it.