Biggest Viair that the budget will allow, unless you can't won't step up to one that connects direct to the battery instead of a lighter outlet, then their highest model # with lighter outlet power.
The smaller it is, the longer it takes, the hotter it gets, and the shorter the lifespan.
Then again, if you can do it, I'd rather get a quiet compressor put at the front corner of the garage and a long enough hose to get where you need to go. That'll give you hundreds or more hours total lifespan instead of less than 10 on a little inflator (might be overgeneralizing).