I used to fly 2 stoke 46 sized models
I planning on moving to 3d flying using a larger model (60-90 size)
i wonder weather should i buy 4 stoke engine like os91
or stay with the 2 ones

as i saw through the forum many people (but not all) recommends the four stoke.
so is it really the right choice ?

by the way why those toc fliers with their huge models uses 2
stoke engines

thanks