There is no correlation. Third times the charm? It's a useless number and you need to ignore it. It's calculated by simply multiplying clocks to units which doesn't take into account the algorithms used by different architectures and how that affects real world performance. It doesn't take into the architectural efficiencies and there are plenty of other factors that affect real world performance that a simple clocks times units calculation doesn't look at. The only thing you have to worry about for resolution is having enough vram.
Both gpus are close enough that I would just choose which is cheaper. If they are the same price too, it really doesn't matter which you choose. Get what you prefer. Most monitors are freesync since it...