Horsepower ratings from manufacturers are like "watt ratings" from car stereo manufacturers. Buying a "200-watt" car amp made by Kraco at the swap meet might seem like a better value than paying 3 times as much for a "50-watt" amp from Kenwood, but all watts aren't created equal.

Saito engines are four-stroke power plants and they are very well made. Super Tigre engines are two-stroke power plants, and they too are very well made. Four stroke engines have more moving parts and are more expensive to manufacture. They don't produce as much power as a two-stroke engine with the same displacement, but they produce more torque and they can turn a larger propeller and they are more fuel efficient and they sound cool in the air.

While you were comparing horsepower and price, did you also happen to compare the weight of the Saito and Super Tigre engines with muffler? 2-stroke engines are normally much heavier than a four-stroke with similar displacement.

The basic comparison between 2-stroke and 4-stroke is one of horsepower versus torque. 2-stroke engines spin small propellers faster while 4-strokes turn larger propellers. If you want the most power for the least amount of money, two-strokes are the way to go. If you want great performance and a more realistic sound from your model, a four stroke might be worth the investment.

You might also need to select a particular type of engine so your plane balances on its center of gravity one way or the other. There are certain ARFs where a lot of pilots are buying large 2-stroke motors rather than 4-strokes because they need the extra weight. The planes tend to build tail heavy and the pilots go with heavier engines so they can balance the aircraft without adding lead weight to the front.

There's really no such thing as a bad engine anymore. 2-strokes are nice, 4-strokes are nice, and every engine has a niche. Your goal is to find the engine that is best designed for your particular aircraft and how you want to fly it. If you're going to fly your Miss America like a high-speed pylon racer, a good 2-stroke is probably your best choice. If you want to fly it like a scale warbird, then a 4-stroke will sound better and will give your model more realistic flight capabilities similar to the full-sized mustang.

Good luck