I personally really like Ultradavid. He comes off very knowledgeable, he manages to remain charismatic without veering too far off of what is happening in game. He has very clear enunciation. He is good at presenting what is occurring in-game and what he believes is the unseen action (mental games, planning in advance, baiting, spacing) and manages to keep the information fairly “jargon” free for the laymen, but technical enough for more advanced viewers.
Obviously there is no “best” commentator. It is a matter of opinion. So who are some of your favorites?