neo v vs galaxy w? not sure this is dejavu or i've seen this before....
have you read gsmarena neo v vs galaxy w review?

im a xperia pro user (which very similar with neo v, the different is just camera 5mp), and i've try galaxy w so i think both of them on par, with some pro and cons.

neo v
+ ICS in late mac or early april
+ design
+ camera - sony phone have very good camera.

samsung w
+ native 3g videocall
+ faster (1.4ghz) and bigger internal memory (4gb)

other
- galaxy w is shorter but wider, neo v is longer (look sexy to me)
- eventhough galaxy w is faster, but no obvious differences
- as u can see, neo v physical button (home, back and menu) have gap with the screen, while galaxy w home button is very near to the screen, and touch sensitive also. this make difference while playing games and texting in term of user experience, not speed. if u type faster, u are prone to hit the home button in galaxy w. this not happen in neo v because of physical button.

lagging? not noticeable. even galaxy w can lag if too much msg, and too much active background apps.

imho - go for neo v. topup sikit, go for neo. at least sony promise ICS update. now already end of february, we sony mobile user tak sabar tunggu ICS. hehe. samsung got? samsung only promise ICS for their dualcore phone (correct me if im wrong).