My opinion;
When it comes to air compressors, BIGGER is always better......Opt for the biggest capacity tank, you can never have too much volume and two stage over single stage, no comparison.....upright takes up less room and easier to keep the tank drained of water.......
Good commercial units will last your lifetime and your kids and your grandkids will use the same compressor.........
The body shop I worked in has a Gilbarco, bought new in 1973,runs all day, 5 days a week, from 7:30 am to 5:00pm, still running today....we changed the
oil and air filter once a year whether it needed it or not....electric motors (5hp) usually lasted about 3 years.....60 gallon upright tank....
I have a similar unit in my shop at home and it runs about the same amount in one month as the body shop unit does in 2 days.......should last another 50 to 75 years!!!!!!!!!!!!!
David