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Two-strokes have a lower parts count. Some confuse this with simplicity. I can accept that.

However, when it comes to theory of operation and all of the "tricks" that must be learned for both types of engines, I see them as being equal. For the moment, let us limit this discussion to engines that draw their fuel via suction only.

As far as more reliable goes, once adjusted properly, it has been my experience that four-strokes tend to stay running more often than two-strokes. With that said, it is very, very close. So close that I wouldn't base a buying decision that placed reliability at the top of the requirements with either one type or the other. To me, it would come down to the actual manufacturer and model of the engine.

Four-strokes have more parts to wear out than two-strokes. This is obvious. Yet it has not been a significant factor in my years of operating both types of engines.

Two-strokes, of equal displacement, can swing as large a prop at better rpm than the majority of four-strokes of equal displacement. Yep, it has proven to be true, time and time again. You may have to do cartwheels and handstands in order to get it to happen (adjust nitro, glow plug, even port timing/size and cooling air flow), but it has proven to be true, at least to me.

Are four-strokes worth the additional cost? To me they are. To others they may not be be. My engine collection is half two and half four-strokes. I like them all.