Best sky system?

What is the best sky system possible with gamestudio? I have seen something about dynamic skies, skycubes and skydomes but i don't know if there are new sky systems with A7 and the last updates.

I may use it but i still have to try all the sky systems. My game will be some RPG adventure and the game cameras will be static cameras and railcams, but not 1st or 3rd person cameras. With this system i cant trick the players and may i won't need high level skies. It will deppende on the scenary.

So i have 2 questions:
- What is the best sky system possible? (eyecandy)
- What is the more suitable sky system for my game?

I have been reading arround but i want expert people to please answer me.

But if i have read ok, people say that skydomes are slow for the games and the skycubes are better in all ways.
Are there any tutorials for making skies and programming them in GameStudio?
Is there any tutorial for making skies?
IS there any tutorial for dynamic skies with clouds moving and sun? (or a demo to see how does it look)

Thx.