As for a compressor, the 2nd one is overrated and there is no way it is 3 HP, $ 120 is kind of high for what it is. Craftsman 3 1/2 HP Air Compressor. 125 psi, 25 gallon tank, 8.5 cu. ft/min @ 40 psi. $120

Most real compressors have the cubic foot rating at 90 PSI not 40. Rating the compressor at 40 gives the appearance the compressor is "bigger" As for the HP rating, the numbers on consumer units have been inflated for years ( same goes with lawnmower ratings, that is why they have gone to Ft / Lb torque )

The third compressor does not have a belt guard and is Taiwan / China made, I'd pass.

For leak down a small carry 110 compressor is fine and might even be able to deal with intermittent impact tool use. A 2 or 3 HP _oil_ lubricated piston compressor would be better for impact use.