Armistice
Son of Yoda
because of the ability to change the settings at will without havin to go through any menus or anything like that.
Admittedly I don't play metal, but I've always used multi-effects because of the ability to step on one thing and get the exact sound I want, not worrying about whether I have the flanger on and the delay off and is the distortion on 2 or 3 and etc. etc. etc.
And if I want a different sound, I just program it into a new patch... set up banks of them for individual songs...
I'm assuming you don't, live on the fly, adjust pedal parameters...
Not trying to change your mind... just sayin' - and in terms of sound, all those patch leads just have to have a degrading effect on the tone...
Good luck! You should speak to Boss about an endorsement deal!