There is absolutely more contentiousness over on the MCM forum, but there's 10 times more traffic as well.
Most of that can be attributed to a select few members.
I find myself getting caught up in those arguments on occasion, but they're easily ignored if you want to stay above the fray.
With the higher membership & heavier traffic, it's natural that there will be more unfavorable content.
This forum has it's fair share of nastiness as well.
On a percentage basis I think you would find that there is little difference.
I wish we could avoid it all together, but it's the nature of the beast with any forum.