Both of them are good, its like comparing an old car model (which was the best at its time, and still runs pretty well) with a new one (looks good, minor and major tweaks to the looks, features and performance)
So, if you're satisfied with the old faithful why go for a shiny new one?
As for OS support: The company still has to make spare parts for both car models till the old model is reeeeally old, no?