Original model tents are best suited for cooler climates - the PVC windows are easy to wipe clean and keep in warmth. The windows can be fully opened to get a good through-flow of air on hot summer days. The groundsheet on this model is clip-up (not seal-in) which makes for quick assembly (great for rapid deployment of multiple tents).
Hybrid models give you the best of both worlds, a practical choice for anywhere in the world. You have an insulated PVC layer on the windows for the winter as well as a mesh layer on the windows and door to keep you cool and keep the mosquitoes at bay in the summer.