There is no "best" version.
Most people seem to have D620r, however there are many others who have the other versions.
Sent from my D620R [Stock 4.4.2]
Click the "Thanks" button if Ihelped!
Click on the image!
Samsung Galaxy 5 Europa (GT-I5500) [CM11] --Rooted--
Samsung Vodafone 360 H1 (GT-I8320) [CM7.2] --Rooted--
LG G2 Mini (LG-D620r) [Stock 4.4.2] --Not Rooted--
w/ Xposed installed, for more info click here
Translated Apps (to Greek):
[Xposed] App Settings