It's kind of an apples and oranges comparison for either, if designed properly. Often, when a company takes an existing NA engine, and puts a turbo on it, they beef it up along the way. Lower compression pistons - that might be a anodized and use plasma Keystone rings, bigger piston pins, piston-skirt oil cooling, stronger rods, bigger cooling system, etc. If done right, one can last just as long a the other. Turbo version does more work and is built to endure it. In fact, sometimes the turbo versions last longer because they don't suffer from being overheated and overfueled, and lugged, resulting in cracked heads. That is very common in some non-turbo automtotive diesels.
Now, is a NA cheaper? Well yeah, usually since it costs less to build. But many times a smaller turbo engine takes the place of a larger NA engine - so that cuts down somewhat on the price difference.
Less things to wrong? One less turbo on the NA, that's all (for many systems), and turbos can last a very long time.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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