We had dinner at both in August.
Tutto good is good, but our service was very disappointing--on the edge of rude. I also think it's very, very overpriced for what it is. For 5 of us (on the DxDDP), our meal was $200. Just crazy I think, and if I had to pay, I certainly would have been irritated. As it was, paying the tip on that was too much for me.
Our food at Le Cellier was better, and our service was very good. Also--I do not eat red meat, but the salmon at Le Cellier was excellent and creatively prepared.
One difference for us, which I think really made us prefer Le Cellier is that the servers at Le Cellier were, strange as it seems, proud of the food. Our server talked to us and pointed out some of the regional foods. The Tutto server was very abrupt.
We had to decide between these two for the Candlelight Processional for our Xmas trip, and we decided to do Le Cellier because my 3 kids all preferred to go there.