The Page/Site Builders comparison is only updated every 6 months.
The two others are updated more frequently.
WordPress Page Builders comparison
What the most popular Page/Site Builders load by default in the frontend.
The Lowest the better (obviously).
Google Docs : https://docs.google.com/spreadsheets/d/1G3mscjIPrtvLTMmq_TJoBwUsXKFqYSvlaGIN-KQ57cA
WordPress form plugins comparison
This comparison will show you how much assets each plugin loads when you create a basic contact form.
A basic contact form should be light, easy to set up and his asset should only load on the page where the form is visible.
Oxygen Builder plugin features
A list of the most popular plugins for Oxygen.