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Hey @Chris
Are these quotes from the same company? Where are you based? That makes a difference in how low you can go.
Is Jinko that much better 
. Don’t know if you can get a diffinitive answer on that. There are plenty of Jinko and Longi advocates, probably more Jinko, but hard to put a price on the difference. We have put Jinko higher in our Best Solar Panels review due to Jinko being bigger, and probably better regarded in Australia. It also currently has the most powerful panel in the world on the market, at 580W.
Check out more info on both of them here:
Cheers
Marty