* Do you like singing or playing an instrument more? This is the most important question. If you genuinely enjoy singing and have fun with it, choir is the better choice. If you prefer playing an instrument and find it more engaging, orchestra is the way to go.
* What instrument do you play (if applicable)? If you already play an instrument well and it's one used in the orchestra (violin, viola, cello, bass, flute, clarinet, oboe, etc.), orchestra might be a more natural fit. If you don't play an instrument, choir might be easier to start with.
* What kind of music do you enjoy? Choirs often perform a wide range of music, from classical to pop. Orchestras tend to focus more on classical and orchestral works. Think about which genres appeal to you most.
* What are your social preferences? Do you prefer working collaboratively in a large group (choir) or within a smaller section of an orchestra?
* What are your goals? Do you want to improve your singing voice, learn a new instrument, or just have fun in a musical group?
* Can you do both (maybe later)? Some schools allow students to switch between activities or join both later in the year if schedules allow. It might be worth checking with your school's music department.
There's no wrong answer here! The best choice is the one that excites you the most and will keep you engaged and having fun. Maybe talk to students in each group to get their perspectives.