Since you are a LEO, hi-caps should not be a big deal...
The SIG has a spring-loaded de-cocking lever that automatically returns to the "fire" position. Not so on the Beretta 92 series.
That means if you train to put the safety on whenever you come to the ready after being pointed in on the target or shooting, you add an extra step with the Beretta: de-cock, then manually flip up the de-cocking lever to the "fire" position.
It also adds a step to your chamber checking and magazine checking. On the Beretta, the "proper" way to perform a chamber check and magazine check (assuming you are not carrying with the safety on) is bring the gun in with the muzzle pointed in a safe direction, thumb cock the hammer with the support side hand, push the slide back about a half inch by gripping the slide halfway between the muzzle and the ejection port from beneath the frame, de-cock with the firing side thumb (right hand technique), then push the de-cocking lever back up into the "fire" position, then perform your magazine check, and back to the ready. Be careful not to cover your support side hand with the muzzle while performing any part of this technique. Basically, you have an extra step in an already long enough procedure: bring in, thumb cock, chamber check, de-cock, flip up, magazine check, back to ready.
Other than that, the Berettas have a notoriously fat frame and long trigger reach.
I'd pick the gun that fits you better, get good training on it, and practice.
And if you feel that you would carry the SIG when you would otherwise leave the Beretta behind, then I would consider the SIG to have a major advantage.