With a turbo, it takes less engine to make more power. To make a naturally-aspirated engine more powerful, you need to increase its capacity and its bulk.
Turbocharged engines are easier to regulate power.
Engines are constantly evolving and becoming more powerful, sometimes at the expense of driver safety. Controlling the speed of a turbocharged car is as simple as reducing the turbo's boost. Turbocharged race engines are less expensive, and more reliable. Also, turbocharged engines don't have to rely on exotic, expensive materials to reduce reciprocating mass . As naturally-aspirated engines become larger to increase power, the stress due to the necessary increase in engine RMP and increased reciprocating mass placed on their various components also increases.