The First Gear has a cool mesh liner, and a few places where you can open up mesh vents. However, they don't let in as much air as I'd like. Similarly, the Dariens just have huge zippers you can open to let in air. Delightful when you're moving, but you tend to balloon a bit, which must look somewhat ridiculous. However, neither jacket would be pleasant commuting in stop and go traffic in 85-90 weather.
Visibility is slightly better on the 'stiches.
They've got some reflective pads that are in incredibly visible locations from the rear. If there are any problems with the waterproofing tape, you send it back, they fix it, and will often not charge you. You like the stylin' better. You can get it at a store now, provided it fits, instead of waiting 1-4 weeks for a 'stich. I have a Kilimanjaro and a one piece Roadcrafter.