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1. The total score depends on the number of captured towns. The tournament winner at the end of the game may not have a single town in their possession, which is quite possible and could result in them having significantly fewer points than the others... Similarly, it would be pointless to make the total amount of gold players have a criterion for victory. The reason is clear. All players will spend their resources on mercury because this is a condition of the tournament – the amount of mercury is taken into account in case of a tie in other parameters.
In other words, the top three players may have fewer towns in total than the bottom three... Therefore, this criterion will not work.
2. The second and third points proposed above are proportional to each other, so you can choose either of them.