Solar quote Perth

I have received quotes for Jinko Cheetah mono black split 370 w and one for Longi mono PERC half cut 370w (18 panels) Is one panel better then the other ?

Also the companies claim Clean Energy approved solar retailers. Is there also an approval for these companies to have an approved install cert.?

The three companies I am looking at for the install are.

Clean NRG Solar and Regen Power and Renew .

Any advice regards the companies and panels would be great.