Organic and semi-metallic brake pads are made of different stuff than sintered metal pads and are typically softer and less grippy; most rate no higher than GG, a full step below sintered metal. They have their uses, though, such as on older bikes that didn’t come with sintered metal pads and whose brake rotors would wear faster with more aggressive pads. Some are made for dual-sport riding where gritty mud gets between the pad and rotor; the softer pad wears instead of the rotor. Organics don’t stop as well when cold, so they contain bits of metal such as copper or bronze that hold onto heat, keeping the pads warmer between stops. Poor cold stops are also common in some racing pads, which work much better hot than cold; their GH rating gives you that hint. Switching to an organic or semi-metallic pad can also make a sensitive rear brake a bit less so.