Hi everyone I'm new to this site and would like to pick the experts brains, I have a 25x30 lofted attached garage 8ft. height loft 20ft height, I have a choice between a scratch and dent new ng reznor 75000 btu or a ng hot dawg 60000btu slightly used but with vent pipe, price is the same for both which one would you choose. I hope they are equivalent units with power exhaust which would allow me to vent to the side I will have to find that out. Thanks in advance.