T-Tops are usally fastened close to or on the console so you can walk all around the boat with a fishing rod. There are other tops that attach to the gunnels like a radar arch.
I fish hard with the boat so a T-top is a must, for a CC where you cruise the gunnels mounts are nice, it provides a nice hand hold.
I like the canvas top, no reason other than "old school" appeal with the cord wrapped around the rail, all my other boats with a tuna tower or half tower had canvas tops so I just like it.
The hard tops are must better though when you have an enclosure it can seal tight to a hard top, it will never make a tight seal with canvas top but again I don't mind getting wet, a little water coming through when it's real rough doesn't bother me as we have rain gear on anyway.
Hope that helps?