Think that either will be fine. For just gaming is the Intel probably the better choice. "Light editing" will be fine with it as well.The 2700 has more threads so in some things,like maybe streaming while gaming,might it have an advantage.
Yes you could overclock the 2700 with a B450/X470 motherboard. A good cooler could be found around/up to $50 already like.
https://pcpartpicker.com/products/compare/TsL7YJ,ffKhP6,sVYLrH,hHDJ7P/
The Thermalright is a good cooler,but make sure it comes with AM4 bracket,means ask the vendor. Think by now it will,but just to be sure. These will do fine at the 9600K as well,for which you will need a cooler also.Maybe for overclocking that would i pick one of the two more expensive as well,although the new...