Fisher Chimneys is not a difficult route, but requires a certain level of confidence in rock and ice climbing as well as good route finding skills. I did not find Fisher's Chimmeys to be significantly easier than the North Face.
I have seen more than one party belay pitches in the chimneys and on Winnie's slide and the ramp gaining the Curtis glacier. A inexperienced climber may also wish for a belay on the summit pyramid.
If your friends have never rock climbed or done any kind of ice axe work, the Sulphide may make more sense. The Sulphide is more scenic, has easier route finding and still offers the rock climbing on the summit pyramid.
The Fisher Chimneys route may start at a higher altitude, but you promptly drop 1,000 feet which has to be regained at Lake Ann and also regained when you are most tired, right before the car. The Sulphide is much less strenuous.