Who is more powerfull Freddy Coogar or Jason

That's a very subjective question that you have there since neither of them are technically alive…yet they can both presumably be "killed", or at least adequately destroyed. Freddy is a spirit, and as such, his powers are fairly limited to the realm of dreamland whereas Jason is more of a revenant and can physically walk about the world of the awake living. The only way that Freddy can come into our world is to be dragged into it by a victim ripping him out of dreamland and thereby taking away all of his special telekinetic powers, glamour casting ability, and all other super abilities. In the physical world he is merely a 5'6" man with a sharpened knife glove, formidable still, but nowhere near the threat he is when you're in his world. Then with Jason you have a hulking and psychopathic maniac with any weapon that he can get his large hands on…or simply use his bare hands to dispatch you rather grizzly.
In a real world fight, Jason outweighs Freddy by about an easy 100lbs of crazed woodsman muscle and stands almost a foot taller than him, on top of having facial protection with the hockey mask. Jason also has more reach with his machete than Freddy does with the glove, so that would be an advantage. Also, since he is much larger than Freddy, he could probably hold him out at arm's length by the head while Freddy windmills at the open air between the two of them.