Is acidic skin better or basic if I am to prevent pimples?

Pop diagnosis. Please forgive my frankness. "acidic / alkaline skin" is subscience / disinformation and won't help you. This is the 21st century and you have a right to effective acne treatment. Benzoyl peroxide (otc), topical retinoic acid derivatives, topical and systemic antibiotics, the oral contraceptive pill, & Isotretinoin are all available for you.