I play some metal songs like Megadeth,Iron maiden and Metallica. I want to buy a pedal which combine preamp and overdrive(distortion) for my first pedal. Now,i consider VT Bass or MXR M-80. VT Bass has nice overdrive sound but w/o blend knob. It maybe lose some bottom? M-80 w/ blend knob but somebody doesn't like its distortion sound. which one should I get?