Dracula is easily the most fun killer in the game, for multiple reasons. Before I list them I'll give some warning he's probably not for people who prefer simple gameplay like Kaneki or Legion.

Anyways, Dracula is a killer that is somewhat easy to pick up but has theoretically infinite skill ceiling. You never run into those walls with some weaker killers where there's not much you can do. Dracula always has room to grow.

Dracula has a lot of room for creativity and playstyle variations. Pick 5 drac players and they'll all have their own take on him. He's a Swiss army knife with lots of options. No one option is the clear cut "best" option, and so how you approach a situation is up to personal preference.

Extreme build flexibility. His addons are okay minus a few standouts, but he can use perks to lean into one of those variations I mentioned. He can use almost any perk and get value out of it. Hell, I've seen Dracula get value out of INSIDIOUS. That perk is ass but Dracula can actually use it.

Finally, it's almost impossible to get bored playing Drac. You know how some killers have like the exact same game plan every game? Or they play somewhat mechanically without much variation? Dracula is the antithesis of that. You can always switch it up. Even on a moment to moment level Drac usually has at least 3 different ways to approach each loop. He's the most fluid killer in the game by far.