In the first Alien, the android is revealed to have an ulterior motive:
a Hyperdyne Systems 120-A/2 android, who is acting upon secret orders to "Bring back alien life form. Crew expendable." ref
This makes him the ultimate company man. He is willing to do whatever it takes to recover the lifeform.
In Aliens this dialogue suggests that times have changed:
Burke: I'm sorry. I don't know why I didn't even- Ripley's last trip out, the syn- the artificial person malfunctioned.
Burke: There were problems and a-a few deaths were involved.
Bishop: I'm shocked. Was it an older model?
Burke: Yeah, the Hyperdine System's 120-A/2.
Bishop: Well, that explains it then. The A/2s always were a bit twitchy. That could never happen now with our behavioral inhibitors. It is impossible for me to harm or by omission of action, allow to be harmed, a human being. ref
I certainly wouldn't describe them as "twitchy," but rather designed to be facilitators of the Company's agenda on missions. In contrast Bishop throughout the movie is very protective of life, and Ripley in particular. He obviously isn't sent to ensure the retrieval of the lifeforms. That role is filled by Burke.
Why would the Company ever deviate from this plan? Why make synthetic workers who wouldn't blindly execute Company policy?