I am going to put my money on the seer winning, I can see everything your going to do and react to it. if you defend I will see past your defense, if you move to attack I can dodge it even if you feint, because I know your going to be doing that. The sparker can only think about what he thinks your going to do and prepare/make a plan for it but he has no way of knowing exactly what I will be doing.
An example that occurred to me is when you're doing a particularly difficult math test and you have absolutely no idea of how to solve it, giving you more time to think about it, is not going to let you solve it.
To put it simply being able to see the future with a 100% success chance is extremely powerful, Feruchemical zinc can help you counter it somewhat but since they are evenly matched in just about every attribute (intelligence, resources amount of atium/charges etc,) you will eventualy be overwhelmed by someone who knows exactly what your going to do.
Also Kurkistan of course the twinborn will win, he has an extra advantage in a (supposedly) balanced match.