Are big 300+ piece kits actually better than small ones?

Not necessarily. Across r/bugoutbags, r/preppers and r/TacticalMedicine threads in the data, the recurring critique is that piece counts are padded with dozens of identical small bandages while the genuinely useful items (roller gauze, trauma shears, real tourniquet) are underrepresented or low quality. A focused 80–150 piece 'boo-boo' kit plus a separate small trauma pouch is often recommended over a single 400-piece bag.