Face to face which of them is the best?

Popescu is a sweeper,not a marker...so you'll see Bulent or Emre vs. Anderson...
the same things can be said for Ogun...

i understand what you mean Emrah,
now i'm talking for galatasaray...Lucescu said the team will play with 3-5-2 formation.It means there will be 3 central defenders,1 sweeper and 2 marker...the sweeper will be popescu and he'll never make marking.even if he wants he can't...he's good at positioning and reading the game but he can't mark anybody..it's his playing style...surely during the match he'll come face to face with opponents but other two central defenders will mark opponent strikers...

maybe...but he's older and much slower now,

as i know Barca sell him because he's not suitable for tandem system,he's not good at one on one...Fatih Terim also knew the fact and put him behind Capone or Bulent...i remember he said "i know popescu is not good at one to one but he has some other skills make him an indispensible member of the team"

it's Lucescu's job to find his best position,we'll see whether he'll do well or not...