I use a brand called N-O-N-E. I agree with @Chumly that any fragrance can and will attract critters, small and large. Car camping in a state park is one thing, but backpacking miles into the backcountry is another. Yes, I can get a tad ripe after several days in the summertime, but I carry a small, quick-dry pack cloth so I can take a quick, but effective, stream bath. A vigorous scrub of the 'pits with the wet cloth and I'm good for a few more days. Plus if you're backpacking there's a few ounces saved!

At Philmont Scout Ranch, deoderant of any kind is absolutely forbidden on the trail - not even allowed in your pack. For a good reason IMO.