I want to apply for a graduate electrical engineering program next fall. I have one engineering professor who has written letters of recommendation for me in the past, however I only know her from more generic courses which I didn't always do well in (hence why I know her from office hours).
The other letter I could get would be from a business professor. I took two courses with him which I got A's in, spoke to him about a startup I cofounded, and was in a student community he chaperoned. He could likely give me a stronger letter of recommendation, however he was a professor for business management (specifically entrepreneurship), and knows little about engineering.
Although I do have one letter from another engineering professor I'll submit regardless (and one from another cofounder of the startup), is it better to have a stronger letter of recommendation from a professor in a different department, or is it better to have a weaker letter from a professor within my area of study?