I have never sailed the shoal keel but I do have the 6'2" keel and I can tell you it is great upwind. I can easily point <30° apparent and even pushed it to about 25° last year in a regatta that allowed me to pass 2 boats in the last 5 minutes of the race.
I have only ever been outpointed in a race by true race boats. Js, Farrs, etc.
I am sure the shoal keel cannot do that.
I would only consider the shoal keel if it is absolutely needed for your area. Unless we are talking about a great bargain on the boat you are considering.
Remember, all boats are a compromise. I may end up buying a new boat with a wing keel so I can cruise the thin waters of the Bahamas.