It’s kind of ambiguous. Either:

1. Vale swapped bodies with Revok and Revok died.
2. Revok and Vale merged minds at the end and became ‘one’
3. Revok killed Vale and was using telepathy to make Kim think he was Vale.
   Melton1 Wanted for Pedophilia:
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Cronenberg is the GOAT!

Revok had DIED in Cameron's body and Cameron's soul/mind was alive in Revok's body. There was no more Revok. It was ALL Cameron at the end.
So it is Cronenberg who is responsible for all the silly body swap films of the late 80's. A true horror….
Norman! What did you put in my tea?

He didn't merge with Revok. Revok died in Cameron's burning body, while Cameron transported himself into Revok's body. At the end, Revok had DIED in Cameron's body and Cameron's soul/mind was alive in Revok's body. There was no more Revok. It was ALL Cameron at the end.

My interpretation: they were equally powerful, but Vale didn't have Revok's complete lack of regard for the minds and bodies of his victims so when it came down to it, Vale actually couldn't bring himself to destroy Revok. It was Revok who directly, or as a result of their interaction during the struggle, set Vale on fire. Then Vale's only option for survival became to merge with Revok in Revok's body. "We've won."

I think so, more or less. I would argue that Vale was at least as strong as Revok but perhaps he didn't think he was, or just felt it was easier to trap Revok than take him head on, as it were.