I use to be Brand loyal ,and fond of Saito`s , but as I get a few more yr`s of flying under my belt , I find chosing my engine , is decided on by the weight and CG of the plane I`m building. If the plane is nose heavy , I would go with the saito, if tail heavy, I would got with the OS 1.20 . I have several different brands of 4 strokes to choose from ,and pick the engine , that helps me balance the plane with the lest amount of weight.
Also have a couple of old Italain SuperTigre 90`s I picked up on Ebay . Went thru them, bearings and new ring , cleaned carbs . One`s in a 4 Star .60 and ones in a Skybolt .60 , lots of power and they have performed flawlessly. So I can not sell the 2 strokes short either. Sry , I probably just confused you more . lol Good luck and have fun.