Both will feel softer. Tour Speed will perform more like a V (urethane cover). Unless there is enough leaves to lose sight of the ball, I just use the V. And that's only to reduce the cost of lost balls. Temps affect all balls about the same.

Play the same golf ball the year round. Developes consistency. Just add a club in the winter and play your Prov1.

Thanks for the replies, I'll give that a go, I've usually used more firmer/less spin ball over winter along the lines of nxt.