Benefits of a 4 stroker:

1. the ability to swing a much larger prop producing more airflow and a larger prop area
2. uses less fuel which means you can use a smaller tank, less rtf weight
3. not near as noisy, keeps neighbors happy
4. way more torque at lower rpms, 2 strokes require much more rpms to power out.
5. lighter than some 2 strokes of same size.

Now as for a 2 stroker being easier to run that's just your opinion. They cost less yes but you get what you pay for.

As for maintenance on a 4 stroker, the only thing extra is periodically checking the valve clearance.

The aircraft may have more to do with 3D than the engine but with a good engine it makes 3D'n much more enjoyable and easier to perform.