What they have:

Literal magic

Immortal Vulcans that are a bit more chill

Personal cloaking device

Weapons that are impervious to scattering fields and ionized atmospheric radiation that renders phasers inoperable.

What we have

(see meme)

I see no downsides.

Anesthetics are irrelevant.

You will be assimilated. (and forced to wire things as directly as possible because that is more efficient as long as it doesn’t hinder future endeavors)