Slow, doesn't really matter, or fast high tenacity Nest?

Even with high tenacity, there are irresistible debuffs, and some stuns, dazes, etc will get through regardless. She's useless when stunned and needs to be countering for damage. EDIT: These's also Tenacity Down, which can't be resisted.

There are circumstances in which slow can be better, but I find a fast Nest better overall. I guess the best option is to have two mod sets.