I'm confuses which to take for a Wolf form Druid.

The text for Wolf and Winter Wolf state:

Your natural attacks do 1d10 damage, do both
piercing and slashing damage, and critically
triple damage on a roll of 19-20.


The text for Bear states:

Your natural attacks do 1d8 damage, do both
slashing and bludgeoning damage, and critically
double damage on a roll of 20.


The text for Improved Critical Bludgeoning states:

Doubles the base critical hit threat range of any
bludgeoning weapon you use, including attacks from
a druid in animal form.


Does this mean that in WOLF form, Improve Critical Slashing and that Improve Critical Bludgeon is the right IC to take? Seems there's a little conflict in the texts.