As Close said they are interlinked. Actually you use your ear training TO transcribe. Ear training is about recognizing/identifying a particular note/chord on the guitar.
Transcribing is nothing more than doing this repetitively for every chord progression/solo/melody and writing it down.
The tools used to do both are similar. For example, the JUSTIN ear training exercises have you listen to a chord/note progression and then you try to find and reproduce that chord/note on the guitar.
If you have finished with the BC and Intermediate courses you should already be well on your way with both of these skills so I don't think you really need to pick. Just do a bit of both.