Coolermaster Hyper 6+ Scenario Opinions

[ANewPrelusion]

I was just wondering which would be the better scenario for the Hyper 6+ CPU cooler

1.) Attaching two Scythe 100mm Fans (one pushing, one pulling)
- Each fan specs
- 2000rpm +- 10% 30.68 dBA 58.00 CFM

2.) Attaching only the stock CM 100mm fan
- 1800 - 3600rpm
20.6-46.4 dBA
31.33-72.14 CFM

I do not wish to mix the CM with the Scythe, due to the CM being a 4 pin connector which is managed by the motherboard PWM, thus no guarantee the two fans will run at the same speeds. (Does this really matter? I just assume so since the fan pulling air out cannot work to it's potential if the fan pushing in isn't providing enough air.)

Which would be the quieter scenario and which would be the better performing scenario?

Any and all opinions are greatly appreciated. Thank You and Happy Chinese New Year.

For those who do not know what the Coolermaster Hyper 6+ looks like...here's the link.
http://www.coolermaster.com/index.php?LT=english&Language_s=2&url_place=product&p_serial=RR-UNH-P0U1&other_title=+RR-UNH-P0U1+Hyper%206%2B