I’m confused. As you have listened to the system both ways surely you are best placed to know the answer? It's like asking "I have a Californian and a French red wine, both of which I have tasted before. Which tastes better?"
Should I eliminate my preamp?
I have been using my Audio Research tube preamp and Bryston amp to drive Magnepan speakers for years. Recently I added a Oppo blue ray player to my system and connected directly to my amp using the balance cables. The reason was to eliminate the signal having to go through another piece of equipment before it hits the amp. Am I wrong or what am I missing?