It is nice to be able to name patches, but even with my appalling memory, I manage with the B2.1U.
I don't think i've ever used a wah that I liked on a multi-effects. I've not tried enough to make a sweeping statement, but suffice to say, using a standalone wah might be more pleasing to your ear!
For OD, Chorus, Octave, Fuzz, and Ring Mod, I reckon the B2.1U has it covered, although some of the overdrive and fuzz models aren't great.
If your patches on the 708 sound muddy, why not try to EQ them until they're right? If it ain't broke.......