The answer to that question will determine which team will do the first review of your application. (We get enough applications that the first review costs quite a bit of time, so we don’t want both teams to review all applications separately.)
You can still express interest in both teams (e.g. in the “Any other info” question), and the reviewer will take that into account and consider whether to move your application to the other team, but Gemini Safety reviewers aren’t going to be as good at evaluating ASAT candidates, and vice versa, so you should choose the team that you think is a better fit for you.
The answer to that question will determine which team will do the first review of your application. (We get enough applications that the first review costs quite a bit of time, so we don’t want both teams to review all applications separately.)
You can still express interest in both teams (e.g. in the “Any other info” question), and the reviewer will take that into account and consider whether to move your application to the other team, but Gemini Safety reviewers aren’t going to be as good at evaluating ASAT candidates, and vice versa, so you should choose the team that you think is a better fit for you.