Now that I've stopped drooling, you made out like a bandit. You may be envious of your bro's cx, but he's probably envious of yours as well. You have a urban assault vehicle.
If there are any hills in your area, your triple should beat his double up hill. (Kind of depends on which one of you is in better shape.)
Don't worry about if the bike is suited for the distance. Put some bar ends on, point the front wheel at where you want go, and roll over anything that gets in your way (with in reason, of course...).