[Guyver Spawn]

I think it is hard to compare the live action Jokers because they are all different from each other. Comparing one to another one is like comparing Apples and Oranges (Both are fruit, but taste very different).

Cesar Romero's Joker was great for his time because Batman during the silver age was very campy and over the top. Jack Nicholson's Joker feels similar to The Joker from Steve Englehart and Marshall Rogers run while having a creative take from Time Burton at the same time.

Heath Ledger's Joker feels like a crime boss from a heist movie meanwhile Joaquin Phoenix's Joker feels like someone who could exist in real life. The less said about Jared Leto's Joker, the better.