With the former, speakers only count as a representation of an abstract human species and the ability to speak is more important than speaking itself.
Linguistic Anthropologists look at language as the measure of our lives.
Rather than looking at language as something which makes us cognitively equal, look at how language allows for and creates differentiation between groups individuals, and identities. Sociolinguists are also generally interested in research around language choice and language change. Generally speaking, Sociolinguists often ask research participants a uniform set questions in order to attain consistent data. Interviews conducted by Linguistic Anthropologists tend to be very loosely structured in order to solicit, to the best degree possible, naturally spoken language. Linguists go to the field to be around language varieties, but are not really among the folks.