I’d going to say Cosworth just for the sake of it. :)
But in all seriousness I agree with Bullfrog it should be very close, Mercedes might be a bit more competitive but Renault might edge ahead like last year.
I’m going to stick my neck out and predict for Ferrari to beat Mercedes.
– Ferrari will beat Mclaren, just like last year, but since Mclaren don’t have Lewis this season, I can even see that margin increase.
– Mercedes will outscore Sauber but not by a great deal.
– Toro Rosso will improve, now they have James Key onboard and more experienced drivers. I think it’ll be nip and tuck between them and Force India.