Let's make the assumptions that
1. They have unequal amounts of metals, but they have the same burn time.
2. They are in an open field with no places to hide or run.
3. The only weapons they have are their hands.
@Anarchy If you want to change these points, then just let me know.
A gold compounder would beat a seer.
They have the same burn time, but the gold compounded doesn't need to constantly burn. Within a few seconds, the gold will have more metals remaining than a seer. Eventually, the seer will run out and be exposed to attacks that don't need to be careful.
This is similar to the scene where Dalinar is fighting at Rathalas for the first time. He comments about how Shardplate is better than having a Shardblade. A Shardblade is amazingly powerful and can kill with one cut, but if they get hit by anything they are still dead. A Shardblade can let you kill people with one punch and you get protection from almost all weapons.
The gold compounder is Shardplate and a seer is a Shardblade.