OK boys and girls, prepare to be raped.
Here is a scene from THBP:
YouTube video
Harry is chasing Snape after Snape killed Dumbledore. At :15, Harry casts Incarcerous. Snape blocks it.
At :18, Bellatrix casts a non verbal spell that hits Harry instantly.
At :43, Harry casts sectumsempra at Snape. Snape turns, blocks the scetumsempra, and casts a non verbal spell back at Harry, knocking Harry on his back. This all happened in about one second. Snape's back was turned, Harry cast the spell, it reached Snape, Snape turns to face Harry, blocks the spell, AND cast a spell back at Harry. All in less than a second. And no, Snape did not rebound the sectumsempra back at Harry. How do we know this? Because Harry was not sliced to ribbons. Snape's reaction time here is greater than any Jedi. All 4 spells in the video travel at least as fast, probably faster than blaster bolts.
Precog was fine during ROTS. What was affected was the Jedi ability to see brief glimpses of the future, as Luke did in ESB. Battle precog was faulty at best.
Verdict? Wizards>>>>>>>>>>>>Jedi, all day, every day, without fail.
Any more questions? I'll copy/paste this into the Snape/Sidious thread.