Are DC superheroes more realistic than Marvel superheroes?

Not at all. In fact I’d say that Batman is a terrible example of a realistic character. I’d even go so far as to say he’s one of the most unrealistic characters.

But first, to answer your question.

DC’s two biggest superheros are Superman & Batman. Right now Batman is more popular, but Superman is still more well known. And if Batman is realistic Superman goes past unrealistic. In fact Superman is so far past unrealistic he can’t even see it behind him (and he can see for light years).

Marvel’s biggest are Spider-Man, Captain America, & Wolverine. Spider-Man is the most unrealistic, but he’s at least still in the same zip code as realism. Captain America is definitely unrealistic, but he’s fairly close. Wolverine is probably in between the two. Well, almost.

Back to Batman being realistic. Here are some of his “feats” as what he has learned.

Mastered 127 martial arts
World’s Greatest Detective
Scored perfectly on all FBI training test (except gun handling)
Master hacker (has hacked area 51 & NASA)
Master inventor
Can meditate to simulate death
One of the world’s best tacticians
Defeated Lex Luthor in a real estate war
And this is all while also being a crime fighter and a business mogul.

The martial arts thing by itself is beyond the realm of being human. And most of the rest are fine by themselves, but trying to stack them all together while still maintaining that he’s “realistic” just doesn’t work.

Conclusion: Batman is a meta human.

Can somebody kill deadpool?

So to know how to kill Deadpool, I think firstly we should know why Deadpool is hardly be killed:

His healing factor -> This one is quite simple to solve, since his healing factor is not instantly, need a bit of “casting time” until he’s fully heal. So to kill him, just step in while he’s still in the “casting time”. Or you can destroy every single cell of Deapool at once, it will kill him
The curse he got from Thanos that he can’t be killed. -> So this one is a bit tougher since you have to deal with Thanos’ curse.

Why Thanos cursed Deadpool? Part of it, Thanos doesn’t like Deadpool’s attitude but mostly because of Death, who he loves, loves Deadpool.

So if you play your part well as a “Love Doctor” or “Love Guru” like what Will Smith did in Hitch :D - Possibly you can ask Thanos to give you a favor by reverse his curse and now, you can kill Deadpool.
The simplest and most realistic way -> Contact Marvel or you can buy off the Deadpool series, then you can literally kill Deadpool by any method you want, in movie, in comic - Maybe Deadpool laugh to dead by a joke from Louis CK or George Carlin
What do you think?