chain or not

chain.php

<?php

//1
public function listByTagGroup($tag_group_id)
{
    return FaqTagGroup::find($tag_group_id)->faqTags->reduce(function ($carry, $faq_tag) {
        return $carry->merge($faq_tag->faqs);
    }, collect());
}

//2
public function listByTagGroup($tag_group_id)
{
    $faq_tags = FaqTagGroup::find($tag_group_id)->faqTags; 
    $faqs = $faq_tags->reduce(function ($carry, $faq_tag) {
        return $carry->merge($faq_tag->faqs);
    }, collect());
    return $faqs;
}

return FaqTagGroup::find($tag_group_id)
    ->faqTags
    ->reduce(
        function ($carry, $faq_tag) {
            return $carry->merge($faq_tag->faqs);
        }, collect());