Rather have Nadal:
- Even if he announces he will play, Nadal might pull out last moment if he is not ready
- If he plays, he is unlikely to make it to SF (let's not forget 2 out of the last 3 years he failed to make semis, and that's without a 6 months layoff before)
- If he somehow gets to semis, he will be tired and worn out since he is not match fit.
On the other hand, Murray is in form, and has shown he can take it to Fed.