I have the Klim Latitude jacket and pants with my 2013 K16GT and rode 5000 miles through WA, ID, MT, WY, CO, AZ, CA, NV and back home to WA this past summer. I mention this because it gives you some sense of the climates I encountered along the way. The daily average high temp was 95F with the hottest day at 112F (Indio, CA) and the coldest at 48F (Yellowstone). Humidity varied but was relatively dry compared to the South East.
I think you should consider what you're trying to accomplish. The trouble is, most road trips involve a variety of weather conditions, so can your everyday commute or typical ride around home. So unless you plan to ride only in warm weather (and if you figure that out, tell me how) it's not just about getting the best venting possible. You should also consider your own sensitivity to heat or cold. Some people and body shapes handle different weather better than others, which is why personal testimony isn't always helpful in deciding which gear is best for you.
I grew up in Southern California, have a tall thin body type and have always had a sensitivity to cold temps and an above average tolerance for hot temps. As luck would have it, I now live in the Seattle area where it's wet and cold 8 months out of the year, yay for me. I can easily pick out a Washington native, they're the person standing around in sandals, light summer pants, and a short sleeve shirt when it's 48F and raining. Now with that back story, let me tell you my experience with the Latitude.
I've ridden with this jacket / pant combo for about 2 years commuting year round (I don't own a car) in temps as low as 28F (with down liners top and bottom) and as high as 112F (with a cooling layer). The gear performed reasonably well in all those conditions, which is incredibly difficult to pull off by any manufacturer. Of course, I've seen a ton of rain in this gear as well which it's managed without any issues whatsoever.
In terms of cooling, I get the most cooling from the arm vents and the pin-down collar. The chest and back vents help but even with the winglets open on the bike, they only accomplish so much. Using a cooling undergarment like the Under Armor Cold Gear makes a considerable difference. Surprisingly, the leg vents were also quite helpful. It's sometimes hard to tell until you close them for a bit and open them again and you're instantly reminded how much heat they're carrying away.
Yes, the Latitude is lighter weight material, and that works better in the heat I think and also makes them more comfortable to wear in general. One important point, the armor and protection in the Latitude is designed for street riding crashes. Klim will tell you that equates to one, high speed / high impact crash and then you say thank you and buy new gear. Gear like the Kodiak and the Badlands is more Adventure oriented and so the protection is designed for several low speed crashes without sustaining too much damage to finish your trip. That's something to consider when you're thinking about how you'll use the gear.
I also like the lighter color options on the Latitude, any color lighter than black helps out tremendously. Food for thought in helmet selection as well.
The Klim gear in general tends to fit a bit roomy on my 6'4" / 185 lbs frame. This helps in warm weather by allowing more air to circulate in general. In colder weather it allows room for my Mountain Hardware Ghost Whisperer (highly recommended) 800 down filled jacket and pant liners. With these liners in, I could hike to the North Pole without issue. The gear is a bit stiff right out of the box but it has broken in nicely. After my long trip this summer, I washed it per the instructions in a commercial washing machine and hung dry. I think washing actually helped break them in further and improved the fit as a result.
Otherwise, the Klim gear has been bullet proof. I have matching gloves and all of it has been indestructible and still looks as good as the day I bought it. I really recommend this gear in terms of its ability to comfortably tackle a wide variety of climates, stand up to hard use, and do so with safety, comfort, style and function.