I pretty much always use full sets, especially once I have them upgraded to at least 2*. The set bonuses are too hard to pass up. That said, I'm pretty much in climbing gear all the time unless I need to be in something else.
Now, if you wanna know which sets I use the most ... that's easy. I love to climb so I'm in climbing gear most of the time. But, I switch to Barbarian gear for any fight that's not in the extreme cold/heat. I change to stealth armor when I need to make a specific raid on a camp, or to catch bugs & stuff since I can almost run up to them wearing that gear and they don't know I'm there. I use my Rito/Gerudo gear in the heat/cold, paired with the snow/sand boots when just running around in either snow or sand ... And then I use the Ancient Armor if I want the Ancient Proficiency buff to use a guardian/ancient weapon on a guardian. But, with the fully-powered master sword now, it's too easy to just use my barbarian gear w/ the master sword for guardians as well.
I have all non-amiibo sets of armor though ... I use the Zora stuff to swim up waterfalls ... and the radiant armor sometimes at night if the stals are bothering me ... so on and so forth. I mean, I guess I use them all except for the Hylian clothing, knights armor, and the champion's tunic. I'd say I use those three the least by far. They are cool looking, but they don't really serve me any purpose.