Personally, I'm fine with both. I'm a recreational cyclist, and I even think an old 3-speed bike suits me just fine. I do tend to stick more to road doubles and mountain bike triples, though. The road bike I have has a great rear cog low-high range, so the 2 chainrings in front provide enough gears for me that I don't need anything else. I have mixed opinions about mountain bike doubles, though-I wouldn't want one (at least not now), but to each his own.