The Sport has rack and fender fittings. The Comp does not. If you plan on not riding in the rain and don't plan on ever needing to carry anything heavy on the bike, you don't need rack and fender fittings. OTOH, it's nice to know they're there in case you change your mind.

The Sequoia comes with 23mm tires and probably won't fit anything much larger than 28mm. The TriCross comes with 32mm and will fit larger.

If versatility appeals to you, the Sport is the most versatile bike in the Specialized line.