Why the Warwick VGU is the best one so far imo.
It's still what made old Warwick Warwick, they actually preserved his identity instead of giving him a new one.
Too often this does not happen. Some champion reworks create kits that are really awesome and function properly but they end up not being a rework of the old champion but more like a completely new release, killing the old identity in the process. Take Gragas for example, who was a very bursty AP diver before but who got turned into a tank, or Poppy, who went from a hyperscaling fighter with a weak early game and was turned into a tank, or Sion, who was either a crit-based Juggernaut or a burst mage and who got turned into a tank.
As someone who was a Sion main before his release and who played both the crit and the AP version of him, I was extremely hyped for the rework. Both builds were fun but for several years he was in a really shitty state and nothing would be done about him until his VGU, pretty much like with Mordekaiser right now. I stopped playing him and just hyped myself up for the rework to be exactly like the old Sion but just a more balanced and updated version of it but in the end I was somewhat disappointed. After playing him a few games as his new tank version I realized that old Sion is dead and new Sion is going to be a fulltank. I'm not saying that his current kit is bad or unhealthy or anything, it's actually pretty good for what it's intended to do, but It's just nothing like what the old Sion was.
But then there's Warwick. Considering the really shitty state and outdatedness of his kit before the rework I thought Riot would yet again kill his identity and give him a new one instead of updating it but boy was I wrong. He's literally exactly like old Warwick, just better. He's still the easiest jungler to pick up but now he also has some depth, he's still a sustain god but in a more interesting way than before, his ult is still the awesome team-carrying suppression tool that it used to be and he's still the prime example for a champion that synergized with on-hit and auto attacks a lot. If you just look at what his current kit looks like and then think about the fact that they didn't give up on that pile of crap and actually updated it, you can just see how awesome the rework really is.
It's a rework that old Warwick mains AND new Warwick players can enjoy and not just the latter like in some other cases.