>>5980224Do you display your toys after play, or just store them?
For display, it depends on how you want it to look. You can have Starscream in jet mode divebombing some robot mode Autobots, or have Bulkhead running over poor Vehicons in truck mode. If you have combiners, it's almost always better to display them combined.
If it's for storage, vehicle mode is usually your best bet for keeping your figures compact. Fiddle around to see if it's possible to compact them further from that point.