From my experience I know one thing! If you put a 4 stroke into the ground you can bet the cost in parts to repair it are "much" greater than if you put a 2 stroke into the ground!

Long time ago I had a goldberg cub with a super tigre 61 2 stroke that lost it's wing in mid air. The fusalage hit the ground at full bore and all it did was broke the prop and bent the needle valve.

Couple of years ago I had an OS 91 surpass 4 stroke that went into the ground from only 5 feet up during takeoff and there was $178 in damaged parts alone.

If I have only been flying 10 times like you say you have been, from my own personal experience, I'd have a 2 stroke on that 4 star 60 until I had more experience flying, period!

good luck