PALADIN IS THE BEST, PLAY IT. WOOOO!!!
Paladin is just my favorite tank, I don't dislike the other tanks but just my favorite one.
The most immediately tangible example is just seeing their really cool super move, that just got improved even though it was (imo) already one of the coolest tank moves in the game. Passage of arms is pretty cool looking too but to segue from that into the next point- Paladin has a bunch of neat niche tools that just gives it that extra utiliy vibe that I don't really feel in other options.
For example they have cover, which can absolutely save a run and makes whoever you save instantly fall in love with you. There have been many times when progressing and say a healer doesn't have the gear to stay alive (maybe they get hit too many times and get vuln stacks, whatever)- and then instead of failing the run, again, you just cover them and they survive and you shrug it off. Passage of arms allows you to protect your team from some of the big raid attacks while also looking cool, spot light on you, team moves to you. Clemency which is a very powerful heal that you can potentially chain spell instant cast, that heals yourself at the same time, can replace healers temporarily (this spell while you shouldn't actively use it, unless something is going wrong, is absolutely epic when you use it in the right situation). They have a ranged component to their rotation which allows you to deal big damage while moving around (and happens to be instant cast as well so you have high mobility while doing it).
There are some other spells that are more shared and not as fully different (like each tank does have a heal but clemency is a huge standout), these more similar would be like Divine Veil- depending on your personality you may like this skill more or less (it's good but requires interaction).
Hallowed Ground is very friendly to use, though keep in mind some attacks, and your cover target's damage, are not prevented. Unlike say the bit more unfriendly Dark Knight or Gunbreaker's anti-buster moves which are a bit meme'd on for their quirks. One thing to note though is Paladin has the longest cooldown for their anti-buster, technically there is some value, in a skilled party at least, with the lower cooldown anti-busters (so don't let how friendly HG is to use fool you into thinking the other tank's have no value, or the trap of "HG needs to be nerfed", just Paladin's is most user friendly meanwhile the other ones 'can' be more powerful situationally).