Brett

Frontend Features: 
 – adds a toolbar to the bottom of WordPress pages that will show meaningful information that helps developers to create optimized WordPress sites. 
 – Info includes SQL queries, query vars, peak memory usage, and a filetrace.
Backend Features: 
 – Provides a very basic checklist with suggestions for development. 
 – Shows basic server stats and information 
 – phpInfo 
 – WP rewrite rules (coming soon)

Developer Toolbar

Adds easy to access data for developers, including a fixed toolbar to the bottom of pages that shows query data and memory usage among other data.

Derrick Hammer

This plugin will show you all the documents rendered on the current page, and their elements in nested accordions. It shows their unique element ID, type, and how long it took to render it and any children
As this is an extension to Debug Bar, it must be activated as well.

Debug Bar Elementor

Output debug information regarding elementor on a page such as elements and performance data. Requires Debug Bar

Developer Toolbar vs Debug Bar Elementor