Originally Posted by Hub Spanner

I have ridden neither, but seen both in bike shops.

I think they are so similar that you should just test ride both and choose the one that fits best and makes you happier. Happiness will be most important during your 80% usage as commuter.

The true component experts should chime it, but if you end up being down to flipping a coin, it looks like you get a little more for your money with the Jamis.