Con is a strong word. There is no 4k. There is no LTE. The thing about 4k isn't you don't have a 4k tv as everybody keeps saying its the lack of lossless zoom when viewing a recorded 4k video on the 1080p screen. Its basically a 2160p video so 2x zoom.
What else is different ?
battery life is slightly better with SD, you won't see that in the shop
games compatibility is slightly better with SD, wait for exynos to catch up
Size, feel, screen, camera all is more or less the same.
Knox is present in both.
The exynos for the moment isn't region locked unlike certain SD models.
nobody, unless you're clued up even realises its the SD in display
What people are whining about is the asking price. I could not find anything really credible otherwise with those reviews which are more rants than reviews.
3rd party support is less for exynos compared to SD, something i think those buying note 3 do not care too much about.