I'd estimate League One to be somewhat on par with Segunda Division B, except for the fact that attendances are low here in the lower leagues. For the average Segunda B game, the gate is between 500 and a few thousands maximum (the latter only for important games)
That said, I rate the Primera Division higher than the Premiership, IMO it is the best league in Europe.
Proud member of the local penya mallorquista! and Dudu Aouate's number 1 fan