Can you recite lines for Friends? i.e. Close talkers, serenity now, master of your domain, the re-gifter, double dipper..... Yada, yada, yada. Seinfeld produced more memorable lines and highlighted more common everyday observations than Friends did, which is why most could relate to something in the show but, Friends however did have better looking people.
Believe it or not, even though I was bullied by people that like "Friends" one thing they never told me was that "Friends" actors was more popular -- all they said was that they thought "Friends" was cooler, for a reason.
Aside from Aniston (and even her career has never really been big), none of the 5 are even known names in Hollywood. "Seinfeld" was the number one watched show. "Friends" never even got to that level. On top of that, nobody even knows who Schwimmer, LeBlanc, Cox, Kudrow or PErry are unless you reference the show and say their character