I used to spend a shitload of time over at optionetics, but as I progressed there was a level I hit that wasn't surpassed over there for sure. Over here at ET, though the scope of discussion is far higher than most of what I've seen there. Not to say there isn't stuff of merit being discussed at optionetics, it's just that ET is outperforming.
As for the actual discussion, as someone has said before it looks just like semantics. Optionetics is saying parity can break in certain situations and one can profit from it, and ET is saying to bet on those situations is ridiculous and so unrealistic that parity is a given to hold.
For those that used to post at optionetics and as per experience, I have found the people who really knew their shit have long stopped posting there. Phil is now here, and the others have been MIA from there too long. After these people left, the quality really dropped. Same old stuff being repeated. Only a few are left that think outside the box.
As for the instructors, I would say only a few are capable, and as for Kramer himself, well there was an incident over there a few months ago where he shot down another instructor's post, where after that his posting style changed. Went from being straight up brutal honesty with good substances on options to nonsensical crap most of the time.