I normally just rank up two Snipers and give them one of each. My Squad Sight Sniper gets Disabling Shot because they're not expected to get into the range to throw a Battle Scanner, whereas on the other hand a Snap Shot Sniper can.
"Warriors of fate, you shall dance bravely. Use your golden wings, and fly to the skies. "
Don't worry, whichever one you choose, if you're anything like me, you'll inevitably find you want the other one :).
Haha! Yeah, kind of. I favor DS more, but I actually keep one sniper with BS. I find I don't use BS too much though since I keep my snipers pretty far back and just rely on Squadsight. However, even in most cases I can kill an enemy who is using mind control and therefore don't always need disabling shot either. DS still edges out BS for me though.