I'm not an Aspen fan so I'd say go the Trane. Those coils are now all aluminum which is proven to be more reliable than the copper tubing used before. Also Trane coils are actually tested with the equipment so they will get rated performance. They also have 10 year parts to original registered owner.
3rd party coils are computer simulated so you may or may not get the capacity & efficiency rated. They are now limited to something like 8% higher than the OEM coil gets since in the past there were some wild claims on SEER ratings so much higher than the OEM got.
Usually Aspen is quoted to get a SEER point for a rebate or tax credit that you can't get with a Trane coil.