Post Still stock 4.3 should i update to 4.4. And how-to?

Hi I'm still on 4.3 MI7, should i update to 4.4? I've heard people saying in the forums that 4.3 is still better. what would you suggest? I just want to root either way i end up going. My pervious note 3 was rooted through ODIN with knox tripped, but when i got my replacement i never rooted it so I'm stock right now. If i stay on MI7 would i be able to use towel method to root? From my understanding NE6 would work with towel method but wasn't sure with MI7. What are some pros or cons to updating to 4.4? Any help would be useful

P.S. if i do update why would be the easiest way to keep all my data, apps , ext.. thanks in advance ~CANGOODZ~