Depends on distance and terrain. Up to 10 miles rt an mtb is fine. The best are old hardtail Fishers, Fujis, Specialized, Trek, Marin, etc. Over 10 rt it's hybrids. 700 tires, flat bars, etc. 20-30 mi rt dropbar cx. My old commute was 42 mi rt. I used a cx and fg. Anything will work, truthfully. It's trial and error. You'll get your ideal rig together. Doesn't take long. The main thing is just do it.