Usually the non-exclusive brands like ASUS just slap whatever cooler they use for nVidia with some minor tweaks on their AMD GPUs, sometimes it works well, sometimes not, you gotta look for reviews on the specific model you’re looking at.
Meanwhile AMD exclusive brands like Sapphire, PowerColor and XFX have coolers built with the AMD GPUs in mind and offer more predictable quality.
From personal experience all I can tell you is all my XFX cards were pretty great and the Asus Strix RX 480 I had a few years ago was pretty good too and still going strong in a friend’s machine so you’re probably fine going with the TUF if those 50 CAD are important to you.
Theoretically it’s possible to generate as many frames as you want between 2 rendered frames, only issue is the more frames you generate the more lag you add to the game and the more image quality you will lose, at a certain point it becomes pointless.