AHA or BHA — which should I choose?

Across the reviewers we read, the rough consensus is BHA (salicylic acid) for oily, congested, blackhead-prone or acneic skin because it's oil-soluble and gets inside the pore, while AHAs like glycolic acid sit on the surface and are better for dullness, texture, and hyperpigmentation on normal-to-dry skin. Many people end up using one of each on alternating nights.