Not sure what conditions you plan on shooting, but if experience taught me anything - it is better to have and not use (usually only at the moment) rather than not have it and need it.
scopes made in Germany 3-15x50 compared to USA made 4-16x50 seem slightly smaller but more importantly they have 6.5 mils more in elevation and 1.5 mil in windage travel.
I have the 4-16x50 and couldn`t be happier.
Coincidentally, they also run a promo on the steiner-scopes.com site, check it...