Any Captain position, is preferable to any F/O position..IMHO. At some of these big outfits, having to wait 20 years for a command, for example is not good. A lot of the command mentality is lost, for good.
The younger you are the better
However, command may not be for everyone. Everyone is not suitable for command .
I have known weasel "Captains" blame the F/O when there has been a screwup. The buck stops with the P in C. Responsibility , cannot be delegated. "If the cap fits, wear it."