The Saito is a glow fueled engine.
4 strokers sound a little better but weigh more and COST MORE and are a little more complicated...more moving parts etc.
2 strokers have a better power to weight ratio often better throttle control, are simpler in basic design, simpler to trouble shoot and cost less.
The four strokes are said to be quieter but actually they just produce a less annoying note. Decibels usually run close. So if Noise Perception is important to keeping your field a four stroke is priceless.
RC engine quality in either one has never been better so enjoy!