Many times you ask me when we talk on the phone about which one heats more and I can only speak from my experience and thinking that cold and heat is very relative, because each person feels it in a different way:
Let's think that we are talking about the same weights to make this comparison and a room at 19°C (which for me is the ideal temperature to sleep).
Wool&linen / Wool&cotton / Cotton&silk
The wool&linen has a surprising breathability. It warms but you breathe...
The wool&cotton warms up more than the wool&linen because you don't sweat as much...
The cotton&silk one warms up much more than the previous ones because silk is not as breathable as linen and it also has a spectacular sateen cotton that is not as breathable...
So; simple answer: the silk&cotton one is the warmest.
Elena.