Engines crit is the go to, no thinking necissary choice in every situation. Engines crippled means a line ship is either not participating as much by falling behind, or a sitting duck waiting to be killed. It really hampers damage over time fleets, more so than burst fleets (but even still, why target any other system?).
I propose either splitting up the engines damanged crit into two like the table top (one reduced turning speed, the other reduced ship speed), that way there is one more crit in the pool. Or just reduce the chances of engines being crippled in general. That way, you can have a harder time getting the engine crit weighed against getting more of the other crits available.