In BvS? "Save martha" by far.
In all CBM?
wow that's hard to pickI mean Deadpool was start to finish comedy gold, same with GotG But one of the ones that ALWAYS cracks me up is in the original Iron man "Yes, I'm late, I got held up doing a piece for Vanity Fair"

Thanks to Batmeh v Supermeh Yawn of Justice, the "S" now stands for Sidekick

Ok for me in BvS it was the "Is she with you?" but not because the line was funny in itself but because it made absolutely no sense as Batman had just been in communication with her.
CBM
I though that when Loki tried to turn Tony by stabbing him in the chest and it now working and the whole "performance issues" thing.
To make a great film you need three things - the script, the script and the script -Alfred Hitchcock

In BvS? The entire movie is a bad joke
There are some funny puns on Deadpool [the "the studio couldn't afford more X-Men" and when he hits Colossus's balls and says "dad?" and also the "Onde est Francesco?" when he turns around after being shot in the back and follows the shooter slowly].
X-Men 1 - Cyclops to Wolverine: "What you'd prefer? Yellow Spandex?"
Dr. Strange: "Mister Doctor" exchange
There are also a couple good ones in Ant-Man and Civil War
"I see you try, I see you fail
Some things will never change"

BvS? Is it puking funny? I don't think so?
For CMB I think it's always been Steve Rogers giving Nick Fury the ten bucks. I laugh every time I watch it and it's so subtle you can miss it if you are not looking for it.
FROM:"Save me Batman, please, save me" WB and MOS TO:"Save me Product Placement, save me" WB and BvS

in BvS?
Zack Snyder's direction and Jesse Eisenberg's attempt at acting
What is your favourite joke in a CBM?
Even though I didn't love this movie, but these quotes from it did make it a highlight.
Kaecilius: "You'll die defending this world Mr"
Doctor Strange: "Doctor!"
Kaecilius: "Mister Doctor?"
Doctor Strange: "It's Strange"
Kaecilius: "Maybe but who am I to judge?"
It's not so much the use of Strange's name that made me laugh, it was just Mads Mikkselsen saying "Maybe but who am I to judge?" that made me laugh the execution was great.

Hahahaha yeah!

was probably the hardest I've laughed in a CBM.
God every single line in Deadpool was golden, negasonic teenage warhead killed me.

"Crime Wave in Gotham. Other news: water wer" was really funny.
Though my favorite joke in a CBM was in Deadpool "He got the name Ajax from a dish soap" was probably the hardest I've laughed in a CBM.

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What was your favourite joke in BvS?
Lex Luthor
What is your favourite joke in a CBM?
I do not remember exactly but
There is only one god and I am pretty sure he does not dress like that.