I may be late to the party, and somewhat new to the Cosmere, but these are the results as I see it.
1. The Lord Ruler would totally be OP in this fight. He may not actually be a God, but he is pretty damnation close.
2. Odium wins easily. I forget where I read it, but the guy who grabbed the Odium shard was intentionally going for that Shard. Ati kind of accidentally fell into the Ruin Shard. He used to be a good guy. Besides, Odium has experience in killing Shards.
3. Vin, again, easily. She is a fully developed Mistborn. Lift has a couple of cool powers, but she is not a full Radiant yet. Besides.....Atium. Doesn't matter how fast Lift is.