So, I'm about to play my first league match in a few days against an Eldar player. He has informed me that he intends (as is apparently allowed by the league rules) to forfeit some amount of points in order to choose the scenario we will be playing.

Coming from games in which scenarios are not the order of the day (Battletech and Warmachine) I am not terribly familiar with scenario play, so I ask you this:

Of the Warhammer 40K scenarios, which are the tau best suited to and why? Which ones are they bad at (and once again, an explaination would be appreciated). Also, which scenarios would an eldar player be particularly attracted to-anything they excell at in particular?

Thanks for whatever advice you have on this issue.