I'm not sure there are all that many winners. There are those that lose big time with some places potentially becoming uninhabitable, and those that merely have to spend a fortune on new flood prevention infrastructure, deal with massive changes to how they do agriculture and forestry in a new climate, and in the future deal with streams of climate refugees from countries on the list of even bigger losers.

Russia and Canada might end up winning from this, but for everyone else it seems like a big negative, with some silver linings

Climate change will almost surely increase growing seasons and agricultural productivity in higher latitudes (for some crops). It will be extremely crop and cultivar dependent, I expect lots of R&D to go into crops that can deal with wider vairety, and generally hotter, conditions.

https://svs.gsfc.nasa.gov/4974