I feel like my theater director knows me better than any of my other academic teachers, but I also don't know whether schools prefer academic ones. I know the Common App has the "Other" option as well that I guess I could use if needed. I'm planning on pursuing business.
Even if your theatre instructor knows you better than say your Economics or History or Math or Science teacher, it might not be the right move if you are planning to apply as a business major. If you were applying as a Theatre or Performing arts major, your Theatre teacher would be best.
Business schools are very competitive like engineering schools, especially at the undergraduate level. At Wharton, I think the admit rate is less than 4% versus the overall UPenn admit rate of 5.7%, and that makes sense because Wharton carries a lot of "clout". If you are applying to a business school within a university system, then you want some who can advocate for you as a savvy, astute, clever, entrepreneurial leader who is suited to succeed in business. If your other ECs or Spike(s) are aligned with a business school that would greatly help as well. The reason I say this is that at Wharton for example, they have application readers from Wharton reading your file to see if you are a good fit for Wharton. So you want the recommenders to appeal to the audience reading the applications.
If you are applying to liberal arts college where you don't have to choose a major until your 2nd year, the nature of the recommenders matters less because they are looking for the best students regardless of major.
You could literally ask any teacher who feels they know you better. Don't fret, even I am getting one from my theatre teacher as he knows me more than other teachers.
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