Note that although the Xperia V Moto leads to G in some respects ( Camera, SD, resistance) processor really only has two cores versus 4 Moto G , so even though the latter operating at 1 2 GHz has better performance .
Furthermore, although the Xperia V has SD card slot should be aware that many apps do not allow installed in the SD (now , fuck that go to the Moto G for the 16GB ) .
Also important is the size of the screen , and the device itself . The Xperia V has a 4.3 "screen and G Moto 4.5" , however , if you look at the overall dimensions of both are practically traced .
Ie the Moto G in the same space has more screen (also weighs more, but has more battery).
This is already more personal , so you decided you prefer , but you have to note that although the Moto G has more screen will not occupy more in your pocket.
Of course, if you give great importance to the camera, the Xperia V you have a better camera (although Moto G is not so bad , and has the curiosity of the video in slow motion , another thing is how you use it ) .
Both are very good options , it's clear that you've bothered to look a little. Obviously , the price is imported, and about that wins Moto G, as you note in addition to being more updated .
Hope that helped a little .
PS: If you decide on the Moto G, I inform you that in Expansys.es have stock of 16GB (15 € more expensive , of course) and also the shells of all colors at the official price .