I feel like I can't fault people for liking holy pandas if they haven't tried anything else. And maybe a bunch of people really like a medium tactile switch - I don't know :P But as for whether to go U4Ts or Sunflower/Kiwi/Regular T1s. I would actually go with one of the trio rather than U4T. I find them less noisy and actually a bit more tactile than the U4T and the longer stem pole makes the bottoming out feel a lot harsher - however, that's just my personal opinion. And they're all excellent switches. So you can't really go wrong.