Both look like an excellent choice, as said three tuners will allow three recording at same time while watching a recording for example, whereas two will "only" allow 2, both will allow recording while watching another station and a useable series link. I am big fan of the Vu+ boxes, use the solo2 myself, I hope you mean the Duo2? As the Duo is too slow, duo2 different beast.
@Jazzie, PM me if you want picons and how to install them.
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The more I look at them the more I'm swaying to the Duo2, might sell a solo2 and buy one now, thanks!! lol. Although don't think either are a bad choice, the speed of the Vu boxes just amaze me every time