Jedi vs Sith

It truly depends. THe Sith, on one hand, are usually better within the short term, and Jedi better in the long term. THe Sith have seemed to fail every time they tried to purge the Jedi Order. THe Sith Triumvirate, Sidious, Darth Krayt, they all failed. The Yoda said, that the dark side is not stronger than the light. I would say, in the long run, they can almost be even.

the sith have more powers they can use, it is also easier.

I would say sith, since they've been around longer more knowledge is probably in their arts.

The sith were formed because of the great schism when Dark jedi were banished to korriban and mixed with the sith species. However, the Jedi have never put a blow to the sith entirely either. Darth Krayt, and his sith armada arose, and so did palpatine again.

After Vader's death, Darth Krayt came to power after Palpatine used his spirit to enter a cloned body he kept on another planet. THe Sith is an ideal, and will never be wiped out.

That stuff is canon though.

As far as I know, everything has to be checked by Lucas and he has to give it his approval.

I would say there about equal. The Jedi would get the edge in terms of power by a slight edge but Sith have force lighting so i say dead even.