Yes Macguyver would pwn Jigsaw. The reason being that they are both geniuses and Jigsaw intentionally sets his traps up so they can be beaten, that is the entire point. Macguyver is smart enough where he is likely to think of/improvise a way out of anything that Jigsaw comes up with, that Jigsaw did not conceive of and probably bypass the usualy "self mutilation" requirement.
Saw more or less relies on the idea of Jigsaw targeting people who aren't really all that capable. He also wouldn't have any motivation for going after Macguyver the way he's defined.
The last few movies being an exception (and a bit more hokey). If your using a Jigsaw impersonator the trap might not be designed with a way out, but Macguyver would still find a way since he's at least as good an engineer as anyone involved in that show.
Basically when you consider Macguyver's nemisis was supposed to be the world's greatest assasin (Murdoc), I'd consider Jigsaw and any of his apprentices a step down.
That said the SAW movies are "fun" but they have started relying on a level of alleged "prediction" and human stupidity to work that is ruining the whole premise.
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