What’s the real difference?
In a studio, your people go to the photographer. On-site, the photographer comes to you. The goal is the same: a team page that looks like one team.
When does a studio make sense?
A controlled room and the same backdrop every time. If it’s two or three people and they don’t mind the drive, it’s simple.
Why bring it to the office?
Time. Nobody loses a morning to traffic. People step out of a meeting, stand or sit for a few minutes, and go back to work. I can get through about thirty people an hour.
Will it look like an office?
It shouldn’t look like a conference room. I look for the spot with your office’s own character, often the lobby with your logo or a big window with something interesting behind it to blur.
That way it looks like your place, not a backdrop anyone could have.
Which fits a bigger team?
On-site, almost always. One day, one setup, everyone in the same light. New hires get the same spot later, so the page keeps matching. Team page portraits covers keeping it current.
Standing or sitting?
Both work. Plenty of people stand. Pick one and keep it the same for everyone.
Portraits for the whole office walks through how the day runs, and what to wear helps people get ready. More is on portraits for teams.