When it comes to the fans, you can't have both at the same time: good airflow and low noise. Either it's good airflow with high noise OR bad airflow with low noise.
Though, there are fans out there that struck near perfect balance between good airflow, good static pressure and relatively low level of noise. But those fans come with premium price and question here is if you're willing to pay the price.
If you are, then look towards Corsair ML Pro series fans,
120mm, specs:
https://www.corsair.com/us/en/LED-Color/Fan-Size/Package-Quantity/ml-pro-led-config/p/CO-9050042-WW
140mm, specs:
https://www.corsair.com/us/en/LED-Color/Fan-Size/Package-Quantity/ml-pro-led-config/p/CO-9050048-WW
review 01: https://www.kitguru.net/components/cooling/leo-waldock/corsair-ml140-and-ml120-fans/
review 02: https://thepcenthusiast.com/corsair-ml120-pro-led-120mm-pwm-premium-fan-review/
120mm, pcpp: https://pcpartpicker.com/products/compare/LkJkcf,GXkwrH,MpBrxr,wPFXsY/
140mm, pcpp: https://pcpartpicker.com/products/compare/D34NnQ,cfyxFT,sYNypg,ycH48d/
In my Skylake and Haswell builds (full specs with pics in my sig), i have those very same fans in use (red LED in Skylake, blue LED in Haswell) since these fans are one of the best (if not the best) fans when it comes to the balance in airflow and static pressure. Sure, ML Pro LED fans have premium price but they also have mag-lev bearing (one of the few fans that have it).
Pros/cons wise, you're looking at:
120mm
Pros
* great airflow (12 - 75 CFM)
* great static pressure (0.2 - 4.2 mmH2O)
* great RPM range (400 - 2400 RPM)
* PWM control (4-pin fan)
* mag-lev bearing (300.000+ work hours)
* 4 color options (red, blue, white LED and non-LED version)
* warranty 5 years
Mediocre
* noise output (16 - 37 dB(A))
* power draw 0.299 A
Cons
* price
140mm
Pros
* great airflow (20 - 97 CFM)
* great static pressure (0.2 - 3.0 mmH2O)
* great RPM range (400 - 2000 RPM)
* PWM control (4-pin fan)
* mag-lev bearing (300.000+ work hours)
* 4 color options (red, blue, white LED and non-LED version)
* warranty 5 years
Mediocre
* noise output (16 - 37 dB(A))
* power draw 0.276 A
Cons
* price
To get the best possible airflow with the least amount of noise, install as many fans in your case as possible. Preferably 140mm rather than 120mm since 140mm fan moves more air and does that more quietly than it's (same spec) 120mm counterpart. Making the fan setup in the Meshify C Mini case as follows:
front - 2x 140mm intake
bottom - 1x 120mm intake
top - 2x 140mm exhaust
rear - 1x 120mm exhaust
With 6x fans, where you have 3x intake and 3x exhaust fans, you'd get neutral pressure. Also, while installing 6x fans in your PC may look like that you'd get extremely loud noise out of your PC, it's actually vice-versa. The trick is that the more fans you have inside the case, the less each fan has to work to maintain the airflow and the less noise fans produce.
And that is also a main reason why i have 7x high-end case fans in my Skylake and Haswell builds (Corsair ML Pro LED and NZXT AER140 RGB). Mostly 140mm but few 120mm as well. Since i have that many case fans, i can keep all of my case fans spinning between 800 - 1100 RPM and thanks to this, my PCs are very quiet while still having proper airflow inside my full-tower ATX cases.