RE: Strokes
Saito's are manufactured to be light engines so they do weigh less than an O.S. 46.
I turned around and mentioned that the relatively small Magnum .52 RFS weights more than the O.S. 46.
But then that is not comparing apples to apples at all.
Of course there are also 2 strokers that weight less than the O.S. 46 too.
"The 2 cycle will typically spin the same prop faster though. "
The engine that produces the higher RPM's with the same prop, produces higher power.
In the smaller engine sizes, to obtain the same output power on a four stroker, compared against a 2 stroker, I need to increase the displacement of the 4 stroker. THEN you can swing that "bigger" prop.
It's not that I have anything against 4 stroke engines... but quite often the marketing hype is taken to be gospel, and in turn bantered around to newbies too...
A .60 four stroker doesn't compare to a good .46 2 stroker in terms of output power.
Which answers the original poster's question...
You can save the money if you wish, and use simply use a 2 stroke engine.
In the OP's shoes I'd use the 4 stroker when I desire more "scale like" sound, looks and performance.