We have a cottage/wildlife type garden and don’t use slug pellets (have a small pond and lots of happy frogs)
The cottage style flowers that seem to fare well include:
Nasturtiums
Salvias
Scabious
Lavender
Alliums
Most herbs (sage, chives, parsley, fennel, marjoram)
Lots more but that’s the ones I can think of now.
If planting something vulnerable, you can try keeping a good foot or so of soil around the plant constantly disturbed (by hoeing or lightly turning with fork every couple of days) until it is well established and too big for them to do much damage. This isn’t foolproof but I have found that slugs and snails won’t venture very far over disturbed soil and it can put them off temporarily. This worked for us last year when we planted climbing beans.