Desperate_Role_3940's journey

I recently found myself in a bit of a dilemma after quitting a minimum wage job just two days in. Today, I reached out to see if I could come back, and to my surprise, they said yes. However, I've since found another job opportunity that I would prefer to take. I'm unsure how to communicate this to the first employer without coming off as flaky or unprofessional. I want to be honest but also maintain a good impression. Any advice on how to handle this situation?