I am mostly gas now, but will always own some glow engines. One of the big things I like is the lack of oil getting all over the airplane, helps preserve the finish. I think in general a gas powered airframe will last longer than a glow powered one.

Pay particular attention to the fuel tank. Avoid stoppers, and I would not convert the old glow tank with a gas stopper. You are asking for trouble here. (unless you like fuel inside the fuse and deadstick landings). Just get a Bennett built tank or one from Fortitude. You will not regret this.

Gas is wonderful. Have fun.