Take this scenario

Binaltech vs Alternators

BT - have all except BT-17 (Black Convoy which was really expensive even when released). Also have all BTA and Kiss Players
Alternators - complete set including two box variants

Binaltech is (to me) the better line - die cast, better paint scheme and 'they feel complete. So naturally if I was to keep any BTs or Alternators it would be BT all the way ... HOWEVER

Alternators have 2 completely new castings (Rumble and Ravage v2) that have not been released as Binaltech, along with 3 recolours (Decepicharge, Swerve and Camshaft), 1 cheaper recolour (Nemesis Prime) and 1 better casting than BT (Mirage). If I said I was going to sell off Alternators and keep Binaltech would I have to give up the new castings and the recolours and have just a BT set, or do I keep a few selected Alternators mixed in with the BTs.

... *ponders*