I've grown Kestrel for years as my core variety. There is very little slug damage. Even this year, when the clay soil stayed wet under the mulch they were fine. They have the other advantage of maturing ahead of the worst of the blight season usually. I grow them as a main crop, though they tend not to keep as long.
The Pink Fir Apple weren't too badly hit either (and are a fun potato to have). The Charlotte were OK but more were damaged.
Most other varieties I've tried have been absolutely riddled with slugs.
I've used Nemaslug on the plot for years now, so the slug population may be lower anyway, but even so the difference between Kestrel and the others is significant.