Compressors, pressure washers and a few other things in life in my experience are alike in that it is EASY to get one that is 'just a little bit smaller that I would have liked', but almost impossible to buy one that results in the owner's commenting 'Gosh, this is just too big, I wish I would have gotten one a little smaller....'
I have a 11 hp pressure washer and a 7hp air compressor. I have asked myself ' I wonder what a little more HP would be like...' although I am very happy with the performance of both units. In both cases I bought the biggest one I could afford at the time and have never regretted it a bit. regards, Joe.