Hello Pierre-Yves,
There have been several threads talking about speaker cabinets used by club members. If you search on speakers and opinion or rig you should see several recent threads on the subject.
What most of the threads show is we forum members use just about every brand and model of speaker that is available. Each of us purchased the speakers based on the sound we want to hear. I use Bag End 18's and 2x10's for my main stage rig. Others use Eden, EBS, Bergantino, Epiphany, Schoeder, Acme, etc. As far as speaker sizes it is the same. There are people using 10, 12, 15 and 18 speakers in different combinations to get the sound they are looking for.
Keith