Hi Dave,
I am a hard-core commuter and have a little experience to offer.
Both those bikes are so similar in features I think I'd shop for price and fit rather than sweating the details between them. Bikes are easy to modify a little to suit your preferences and it's easier, once you decide on a general style of bicycle, to figure out what's important to you after you get some miles on it.
I think you are smart in not getting a suspension fork for what you want to use the bike for. They are heavy, complex and not necessary unless you are actually mountain-biking. The tires on these two bikes are big enough so that they will smooth out things enough for general riding. Straight steel forks, although a little heavier, have a bit more spring to them than aluminum and ride a little nicer. Carbon forks are easier to damage but also ride pretty nice.
You'll probably want to add fenders and a rack at some point. Make sure the bike you choose has eyelets and braze-ons so you have the option, should you choose to do so. A dedicated kickstand plate is a thing of beauty and grace.
My progression in the bike thing was, first, a comfort bike, then one like you are looking at and finally a cyclocross bike, which I've been riding for a few years now. I think you are doing the right thing by avoiding a comfort bike. They are very heavy, have a ludicrous sprung fork and put you into a riding position which is too upright. At first, the upright thing seems cool - like an easy chair. But pretty soon, if you spend much time on it, you realize that all your weight rests on, well, a certain tender part of your anatomy.
What I've found works best for me (a geezer) is to have the tops of the handlebars at about the same height as the top of the seat - if the bike fits properly, that should put your back at about a 45 degree angle which lets you use your leg muscles efficiently and distributes your weight evenly on the bike.
Cycling, for me, was kind of transcendental, fitness-wise. I lost around 70 pounds once I got into it.
Oh, and just to keep the thread relevant to the forum, I have a handlebar bag which I have modified inside with cut foam, so I always carry my Canonet QL17 GIII, or maybe the Hi-Matic E or F, or perhaps the Konica C35, sometimes the Konica Auto S2...
Mike