Hi Marco, u
It is a good question and always we try to select the best navegator, but not always we could use the one we want because of the project or because the client that use some navigator predefinided.
In my opionion i am a big fun using IE Plugin, and if i can i use it always.
I know that in some cases it is very difficuld because you have to install in the server and in each computer to see the results, but gives the posibility to work with macros that always will work ok.
If you want see this
From my opinion we have to select the best option ever and try to adapt to the navigator we had choose