Mountain Bike Suspension Revalving What Would Be Better A Hardtail Mountain Bike Or A Full Suspension Mountain Bike?

What would be better a hardtail mountain bike or a full suspension mountain bike? - mountain bike suspension revalving

The walk up to spend $ 700 on a bike to ride. I live on dirt roads. I want to travel 20 miles on a bicycle. I'll go 4 miles of dirt roads and the streets are still unpaved. Ideally, a hybrid, rigid mountain bike or full suspension mountain bike?