i am having 2gb variant, i used CM13 for 2 months,
1)Gaming improved, ( i dont know what cm13 does .. but i can play many games without any lag -- ex : NFS nolimits, RealRacing3, Modern combat 5)
2) The UI is smooth .. and has faster and better Ram management than that of stock
3) Highly Customizable ( like all others )
4) Latest Gestures which are in G 2016 edition are also added
5) SUpport .. what ever your problem is, they are listening
6)Last but not least : Monthly Security Patches
1) as performance is boosted, Battery gets drained when we play any game ( if i play NFS no limits i get 2.5 hrs 100-5% battery)
2) No moto Display ( ambient is there, but i dont feel it convincing)
3) voLTE support in INDIA, i cant find it in CM13 .. so had to change to stock rom...
this is according to me..