Brought to you by Kaladin Stormblessed
Here we have Brandon Sanderson’s Cosmere (Mistborn, The Stormlight Archive, etc) versus Tolkien’s Legendarium (Lord of the Rings). No direct interference from gods (In other words, no Shards, no Illuvatar, and no Valar).
Splinters and Maiar are OK. Merged timeline/composite (In other words, even though Saruman died, he can still participate, as can his army even though it was destroyed).
Characters and armies can only be used if they appear in the main timeline of a book (not flashbacks).
Each planet has a portal connecting it to the other Shardworlds and Arda.
Which side prevails?