So you have used IE since IE5 and you make statements about something you know nothing about?
I have never developed a plugin for either, but someone saying that MS doesnt help developers needs to look here [
http://msdn2.microsoft.com/en-us/ie/default.aspx], they may be in for a shock.
But I'm not going to vote since I have not done either. I just wanted to throw in my 2 cents about IE Addon Development.