Indigo 6600 vs 6900

Any suggestion/ideas which one is better?

Or what are the main specification differences?

Thank you in advance!

 

Main differences:

6900 has Zuwa pump - 6600 has Old imaging oil pump
6900 has 12" silica gel - 6600 8" silica gel filter
6900 has new TSP on UW and RW - 6600 has old
6900 as default has new Ceramic Charge Roller - 6600 Old rubber
6900 has SPM - some of 6600 could have Old ILD
And on 6600 RIO system was an option, on 6900 is by default.

And all other small fixes instead of 6600.

 

This is amazing! Thanks a lot!