Neither. And both. What I mean is that it depends on what is limiting your squat. If you are fast, but not that strong, I would say Smolov would be good. If you are strong but slow, Westside would be better. Another way of looking at it is that Smolov is a routine, Westside is a complete powerlifting methodology. It will serve you better as a long-term approach, but the Smolov routine can build up your squat a lot in a short time, if strength is a limiting factor.