Here in the states, GRK is a little more expensive than Spax (very slightly tbf). Their tips are really good, but imo nothing compares to the serrated tips that Spax has. It makes things so simple.

The shorter Spax screws also accommodate a Robertson tip really well also.

That said, GRK, if that is the best you can get, is going to treat you well. I might not like them as much, but they are a quality product.