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These two forces each represent a distinct side of the good/evil fight which has been raging since such concepts existed.
The active and powerful Tri-Force has showed up to stop the subtle machinations of the One Ring from bringing low an unsuspecting world, by ushering in the black dawn of a new dark age.
Can the Tri-Force defeat the forces summoned by the One Ring before those forces can summon the Ring's master from the void to which he was banished.

The Tri-Force is able to be weilded by evil, and will bend the will of the user.

The One Ring realizes the awesome might of the Tri-Force, and tricks them into merging with it creating a greater weapon evil.

actually I think that would happen... the One Ring would "fall into the hands" of the Tri-force wielder and therefore be in control of it... Yay Ring