i first had the note 2 (n7100) with andoid 4.1.2 ...then upgraded to 4.3 and then 4.4.2 and for me the best user experience was with the 4.1.2 and the worst was with 4.3
On 4.1.2 battery was great then i update to 4.3 ditto rom and the battery was a bit worse but on 4.4.2 stock its fixed again and i get more screen time then on 4.1.2 stock , i get about 5h sometimes 6h screen time (playing games , surfing the net , watching movies ) and it lasts for 2 days . So from my experience its 4.4.2>4.1.2>4.3
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