OK
i vote for demo, for me he has a very versatile playing style
i like to use nade launcher , targe n charge and eyelander, i can counter every single thing is the game except a airblasting spammer and the natascha \ ofcourse ubers. the speed , health boost , damage protection, free crit after every charge,make me able to do almost anything to any class, only downside is my aim on my nade launcher is what usually kills me aside from random crits
the charge is a very useful tool, if you master this, this your good. its a great way to surprise attack and insta kill anybody with less health then 240
and it gives you a getaway move