LESS IS MORE
THE term mono-tube is a term that doesn’t accurately describe the differences between twin-tube and monotube shocks, and what’s better for your needs. A shock absorber works by pushing a piston with small holes in it through oil. The harder for the piston to move through oil, the stiffer the shock.
Mono-tube shocks have a second piston keeping pressure on the oil with high-pressure gas on the other side. That piston keeps the oil pressurised, stopping it from foaming and passing through the piston easier (shock fade). The design fits inside one solid tube, so it loses heat quicker (perfect for corrugations) and gives you more dampening force for the thickness of the shock.
Traditional twin-tube shock absorbers have an outer sleeve with low-pressure gas trying to control the oil. They’re more prone to fade but considerably cheaper. Without a second piston in line they typically have longer travel for the same overall length; the outside tube also gives a layer of protection from dents stopping the piston working.