Would it bother you, as a reader, if you were reading a ya novel from two pov's, and the chapters weren't split evenly betweeen both mc's? The story is "theirs", kwim? This isn't a "are the two pov's even necessary" issue.

I'd say the percent is something like 60/40. One pov is more "intense" and that's the one that has less page time. I want the pov change to feel natural and necessary.
As long as you do it from the start...
I mean, if you give the first 5 chapters to one character and then, out of the blue,
you change it to the other, I'd be bothered. Mainly because I wouldn't see it coming.
But if you start chapter one with MC1 and then chapter two with MC2
and more or less keep the consistency throughout the novel, I'd be perfectly ok with it.
What I don't like is thinking that I'm gonna be in a character's shoes
all the way 'til the end, to later on discover that in fact, no, I am not.
The sooner you let the reader know
about the two-POVs-thing, the better.
I'd say the percent is something like 60/40. One pov is more "intense" and that's the one that has less page time. I want the pov change to feel natural and necessary.
I wouldn't want 50 pages of one character only to get jerked into the head of another. I'd rather have knowledge not too far in that we're going to have more than one narrator.
This. I'm a conservative reader, so I only love surprises and twists in a book's plot, not in its structure.As long as you do it from the start...
I mean, if you give the first 5 chapters to one character and then, out of the blue,
you change it to the other, I'd be bothered. Mainly because I wouldn't see it coming.
But if you start chapter one with MC1 and then chapter two with MC2
and more or less keep the consistency throughout the novel, I'd be perfectly ok with it.
What I don't like is thinking that I'm gonna be in a character's shoes
all the way 'til the end, to later on discover that in fact, no, I am not.
The sooner you let the reader know
about the two-POVs-thing, the better.