Birchall offers more offensive power, Tiger offers more defensive, if I have to pick one for my team, I would go with Birchall. Nothing personal to Tiger, but he is yet to impress me, he have alot of energy, but he passing, trapping and shooting sucks.
I feel he better off playing defensive midfielder than wing.
Birchall will be our main man for 2010 also, he is growing and becoming a very good player, he can pass, trap, shoot, cross, dead ball, tackle, fighting sprit, fit, everything, he just needs the experience now, he has more to offer at the moment.