small groups (3-4) and large groups (7- 16)
Group skills :
Large group
It's difficult to know the competence of each member because we know some of them can only have 5 seconds with the simplest part, which is not enough to say how talented they are
The company is really focused on the center, main vocal and rapper , the only thing they can do to stand out is doing solo project..but some agencies don't allow their idols doing that (or at least just 1)
Plus , I don't trust K-variety show and their survival show or live band : all their voice is made in the studio and can be rectified ,even famous K-Channel "It's Live" which is supposed to be live isn't
But as far as the global skills go, they've done a really good job, fans are really focused on the group and the music itself
Small group
It's really the place where all the members can have a moment to show off their skills, obviously they have more line and more screen time, which is easy to be exposed in public eye
producer, stylist, makeup artist are really focused on their individuality and do their best (or at least they try) to show off their color
But the thing is .. it's not easy for idols , the more you are exposed, the more you have no right to make mistakes , you can be easly caught
The harmony of the group is not really praised and the chorus is often made by one or 2 members
Dance skills :
no matter how you look at it, dance group with many members will always look better and can easily dominate the stage with simple choreo...they can do all those spectacular acrobatics move
while small groups need to make a catchy move with unknown and sometimes strange choreo ,they need to use their charm a lot
(but I'd rather watch a catchy dance with few members than bring backup dancers unless they bring a lot of dancers like 10)
In conclusion, 5-6 members is the best ... it's not considered small but it's not a large group too