Maple shells are the most popular all-around choice, offering a warm, balanced tone with even frequency response across low, mid and high ranges, suiting most musical styles. Birch shells emphasize high and low frequencies while scooping the mids, producing a punchy, present sound that cuts through a mix well, historically favored in studio recording contexts. Poplar, often used on budget and entry-level kits, sits tonally between maple and birch and is a cost-effective way for beginner kits to still sound reasonably balanced, even though it doesn't match the resonance or projection of premium tonewoods. Shell material matters, but head choice and tuning have at least as much day-to-day impact on the sound you actually hear.