Enterprise-B would be the best era,striking the best balance between too advanced and not advanced enough.
The ship itself looks magnificent,even though that idiot Carseon
only gave us a few shots.
I actually agree.
There is at least a 20-30 year gap of time where the adventures of the Enterprise-B could take place.
We have no idea of its history aside from that abortive shakedown mission.
It could've been sent into deep space on an exploration mission for years.
It could've been the flagship of an armada on a mission to deal with a new alien threat.
Heck it could've made first contact with the Cardassians, Breen and alot of other races we saw later.
It could've done all three.
The choices are endless.