Close, but one main difference....
The Valentine tells you not only that there is radar, but how many And where they are ( front, back, or sides ). Once you learn to "read" the signals, you don't get caught in the different tricks they use. I have been saved more than once because of these extra features.
As far as actual signal range, type, etc. I'm sure the Bel and Valentine will be very close in detecting distance, but again, the extra info from the Valentine can make the difference.
However, having either or both of these does not mean you should drive beyond you capabilities or road conditions. Fast can still be safe but only under certain situations and with extra "focus".
Ride safe so you can ride again another day,
Ti04