CO2 Tank vs Air Compressor/Tank?



I've been looking at air-down/up solutions to get a bit more traction on the trails (until I'm forced to go with lockers).

I plan on picking up a set of tire deflators, but was wondering what people are using to air back up?

CO2 seems fast and dirt easy, though I'm not sure where to get the tanks refilled in Ottawa. A 10# tank CO2 should do approx 24+ air-ups from 10psi back to 26psi before I'd need to get it refilled, so maybe every 2 months.

The other option, is a 12V compressor with a...
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