Hardtails are mountain bikes with front suspension but no rear suspension. They are affordable, lightweight, and efficient for pedaling. Ideal for smoother trails and cross-country riding, they are not designed for extreme jumps or downhill riding. Full suspension mountain bikes have both front and rear suspension, offering better comfort and traction on rough terrain. They are more expensive and heavier than hardtails but excel in handling challenging trails. Based on your preferences, a hardtail mountain bike like the Trek Roscoe 7 or Cannondale XL 29'r could be a suitable choice. Ensure the bike fits your height and weight by trying it out or checking its specifications.