I like air bags because I can adjust the pressure in the bags.
My rig:
2011 Chevy Silverado 3500HD LTZ CCLB LML SRW 4X4 Blue Granite Metallic.
Bed Rug bed liner, Luverne SS running boards, Air Lift LoadLifter 5000 air bags, Reese Custom Base and Rail Kit, Handy fifth wheel tail gate, rear wheel liners, rear seat storage tray, console storage tray, front lower bumper billet grill, Bushwacker bed rail cap, PML rear diff. cover, Bilstein 5100 shocks, steering stabilizer, Fumoto Oil Drain Valve , Edge Insight CTS.