Pocket Warships are inferior to true warships in nearly every respect--but they can be completely superior in one.
Strategic mobility. A warship is restricted to one, or at most two, jumps followed by a long-term recharging cycle.
Pocket warships are only restricted by the number of jump ships you can assign to them. It would be hard, and ruinously expensive, but with enough jump ships you could move a pocket warship force from Terra to the Periphery in a matter of days or a fwe weeks, dependent on how quickly you could switch out jumpships.
Which makes me wonder-- perhaps that's another reason why many states went to a pocket warship based fleet? I mean, unless you have a fairly small state, it's not enough to have one BB-- you have to have several, especially accounting for downtime and the need to cover certain nodal points.