Comet vs AR replacement pump

For a gx390 I’m looking at the Comet zwd4040g or the Annovi Reverberi RRv4g40d. Theres also the Viper version for the AR VV4g42g. whats the better way to go?

The best way to go is to light er up and get it done. Even if that means being morally reprehensible.

Better way is get a gear drive and compatible 5gpm pump.

Texan I’m not gay please stay away from me