I've gone from a LTE version to a Wifi only version. (i.e from Snapdragon to Exynos) . This is due to the fact that I couldn't find a 32 gb version of the LTE.
Things I've noticed
Menu transitions a tad faster
Program startup a tad faster ( granted this depends on the app)
Game performance a tad better (Note I don't really care much for synthetic benchmarks, yes the dragon is faster in games, but we are talking peanuts in comparison)
Wake up from sleep somewhat faster
Battery seems a tad better (had the Snapdragon for a month and the Exynos for about 2 weeks)
The lag is due to the software and overlay, so neither CPU can really compensate for that . I'de say it's like comparing Ferrari to Lamborghini. In principal it comes down to what you need, LTE or not...?
Performance wise too close to call, unless you look at the synthetic benchmarks, but then you also have to keep in mind that they don'w always represent real life. ( companies cheat like crazy on those benchmarks)