Google AMP: amp-list vs php loop - SEO / Pagespeed

My AMP page serves a list of reviews. Each review is an amp-accordion in order to implement nice read-more features.

I am currently in debate whether or not to load the reviews straight into the DOM (php loop) or load them through a JSON file (amp-list).

When I compare the two versions of this page, amp-list wins big in DOMContentLoaded and Load, but they are tied in Finish with a small favor towards the php loop version.

Assuming the php loop version would be completely AMP-Cached, and amp-list would have to poll the stack for the data, which version would be better for overall user experience / seo ?

Thank you! :D