I also completely forgot to mention another duo - Chip & Ironicus.

This one is a little different as they record their commentary over premade footage. They can also be a bit more... low energy (?) compared to many bigger channels but if there's one thing they (or more specifically Chip) really shine in, is the huge amount of effort put into each and every playthrough.

Pretty much every episode is released in two versions, cut and uncut commentary, to let you choose whether you want the option to focus during cutscenes etc. They are also filled with cool trivia, secrets and just good skill level in general.
They have a pretty legendary MGSV LP where Chip prepared 3 seperate playthroughs, each with a different approach (stealth, combat and goofy).

Besides that, they also have stream recordings with live commentary, a podcast and regular charity streams.

Chip worked at recently closed Volition so he could definitely use more views.