I have to admit that I don't play enough public anymore to have much worth to my opinions. I'd say that from my memories though, Cymro by far leads the most fun squads to be in (especially on the rare times VIOP gets going). Definitly though, DLF were the hardest squad I ever had to defend against (GN3 iirc on Goodwood).
Specifically limited to testing: never was I more proud than when I killed beaver with the spaten. So nice to trade insults with him over TS, shame he keeps running me (and everyone else) over when everyone is milling around while Spit or Kev looks at something. Priest is also good fun in TS. GooGeL has an aimbot that specifically targets me, though he rarely comes on.