A Bitcoin holder owns one asset with one engine: the price of BTC. A liquid cloud mining investor owns a working position with two — the BTC it mines, and the market value of the hashrate itself, which can be sold. In a strong market there's a third force: scarcity repricing. When Bitcoin climbs, mining gets more attractive, demand for hashrate rises, and if supply is tight the price of TH/s can move faster than Bitcoin.
The standard "BTC vs mining" comparison only ever weighs bought BTC against mined BTC. It quietly assumes the mining position ends up worth nothing. Real capacity doesn't behave that way: an ASIC, or a transferable hashrate position, carries a market price that rises and falls. Leave that out, and mining looks weaker than it actually is.