I have the twin and wheel with guys that have power tanks. The best thing about CO2 is speed: those guys air up in seconds while even the twin takes a fair amount of time, at least for larger tires. Downsides of CO2 include:
The tank is large, takes up a lot of space in the Jeep, and can be a safety hazard if not mounted securely.
The tank needs to be refilled, which can be expensive and time consuming.
The Power tank is fairly expensive, although you can assemble a functional system yourself for much less.
The ARB twin is about the same price as a Powertank. Installing it is kind of a pain, but only needs to be done once. It can be hidden under a seat or in the engine compartment, so it doesn’t take up space and isnt going to whack you in the back of the head if you rear end someone. Also, Unless the compressor malfunctions, you’re not going to run out of air, which is nice for multi day trips, helping others, and runs where you air up and down multiple times.
Some people say CO2 is better for running air tools, but I can’t comment on that because I use battery powered trail tools.
On balance I’m happy with my twin, but may piece together a CO2 system just for fun if I can scrape together enough couch change.
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