Driving is much easier to bring any gear and equipment you want, a vehicle that can handle the mountains, good tires with 2 spares, flexibility if you tag out or don't, etc, etc. I have done both several times, and driving from NY (35+hours to western Montana/Idaho) and I do it solo. Leave on a Friday afternoon, and get in on Sunday mid day. gives you 10-11 full hunt days if you take 2 weeks off. I'll take driving every time if I can.