...well they really shouldn't be there
True indeed. Though if a pilot is realizing that they should not "be there", they are probably very much in need of the best information as to how to get out without delay.
If that pilot has recognized a need to outclimb rising terrain, best angle is likely most appropriate. If outclimbing changing weather, or traffic is necessary, and terrain is not a factor, best rate is probably more appropriate.
If you expect to climb for a long period, best rate will be much better for cooling.