Hey guys,
I'm in the process of buying a scale extra or cap, in particular the CM Pro Extra 90, or the Great Planes M.Chapman Cap580 46. I am stuck at the decision between 4-stroke and 2-stroke power so i thought i'd ask for oppinions from you guys that fly them at a very high level. Basically im not after a speed demon, i want it to jsut have heaps of performance and vert ability, but not over powered.

I have two options to take:
If i went the GP Cap 580, would i be wiser to run say an OS FS70 in the GP Cap 580 rather than a .50sx/.61FX 2 stroke? What are the advantages and disadvantages of both engine types?

If i went the Extra 90 which has a recomendation of either 90 2-stroke or between 91-120 4-stroke, would an OS91FX be a better choice than say an OS FS90 surpass, remembering that the 90 size 4 stroke is the lower end of recomendation, will it still perform what i am after?