gistfile1.phtml

<div class="correspondent__stories" <?= $this->hasNext ? 'data-next="'.$this->nextLink.'"' : '' ?>>
    <? foreach($this->stories as $story): ?>
        <h2><?= $story['headline'] ?></h2>
    <? endforeach; ?>
</div>

<? if($this->hasNext): ?>
<div class="correspondent__stories" data-next="<?= $this->nextLink ?>">
<? else: ?>
<div class="correspondent__stories">
<? endif; ?>
    <? foreach($this->stories as $story): ?>
        <h2><?= $story['headline'] ?></h2>
    <? endforeach; ?>
</div>

<div class="correspondent__stories" <?= $this->extraAttributes ?>>
    <? foreach($this->stories as $story): ?>
        <h2><?= $story['headline'] ?></h2>
    <? endforeach; ?>
</div>

I like #1 - it's more explicit than #3. #2 repeats too much

My vote's for #1 too.
#2 has confusing indentation, repeated content and will end up very messy if other attributes are needed.
#3 doesn't make it obvious what the output will be.