I don't understand most of you guys on the selection. 1 guy nailing wall sheathing is going to, or BETTER be, hogging the air. Those little portable twin stacks won't do ****.
You need volume and capacity. Your 20 gallon worked well because of the reservoir but it probably was on the weak side of volume.
If you go gas, then a wheelbarrow type WILL do the job. DO NOT GET A BRIGGS ENGINE! Unless you like lots and lots of noise.
Jenny is going to be my next compressor. It's old Emglo, the way it's supposed to be built.
My suggestion to you is the Jenny K5HGA-8P. Gas, 8 gal, portable, will keep up with your guys no doubt.
Or another brand like it would be fine, but nothing except a Honda motor!
Oil reservoir, not oil motor.