You can't conclude that fans will be quiet just from the type of bearing that the fans uses. You would have to take into account the quality of the motor itself and the blade design, rigidity of the frame also plays a role. If it is true that FDB/HDB fans are quiet, then the Scythe GTs with its ball bearing fans will be noisy but it is in fact one of the most silent fans you could get.
I have a pair of Noctua NF-P12's with SSO bearing which is similar to FDB/HDB fans and it is silent but not that huge of a difference compared to my set of Noiseblocker XLP with sleeved bearing. If you're a firm believer that FDB/HDB fans are quieter, get the cheaper 
Artic Cooling F12 which does come with the same variation of FDB/HDB. I would only get the Silverstone AP series if I wanted the focused airflow for a very particular purpose.