If you had to pick one to buy or use, the 0.6 (2 stop) soft grad is a good all-rounder.
This filter type helps control sky brightness giving a better tonal balance with the foreground, which is why it is a common accessory among scenic shooters. If you had to pick one to buy or use, the 0.6 (2 stop) soft grad is a good all-rounder. The ND grad is a good choice and not dependent on light direction which is not the case with the second option, the polariser. When it comes to skies, popular belief has it that the polariser has magical powers and can transform an insipid sky into something spectacular.