[policipal]

The simplest (easiest) OO model I would argue is Smalltalk.

[Danao]

How C# compares to ST then?

[policipal]

That's a research topic and a few months of study. There is no freebie paragraph that will give you quick cheap answer. You'll need to do your homework to get anything short of a superficial blurb. See my comment above. I think that may help.