Not claiming the Tuxing TXET063 to be a clear winner, just want to point to it, for consideration, when shopping for a portable direct fill compressor.
It meets the criteria, that you should look for in a portable compressor:
1. Availability of replacement parts.
2. Availability of a service kit.
3. Oil port to keep the compressor piston lubricated.
4. Water and oil drainage port.
Any compressor that doesn’t have a parts source to maintain it, and an oil port to lubricate the piston, should be considered a disposable compressor.
Without the ability to lubricate the piston, it will start to gum up, slow down, loose the ability to deliver pressure, and will eventually cease up or break a shaft.