IF you have the headroom (They are a bit taller) Do give consideration to going with a pair of GC-2 Six volt.. best price is at Sam's Club..
REASON.. Setting aside the features of the six volt pairs over a 12 volt pair for a moment.
The result may well be LESS EXPENSIVE.. that's right.. Often you can get a pair of sixes for less than a pair of 12's.. how's that for an argument in favor of them?
But do comparison shop
Now if you want to know the other advantages and disadvantages we can discuss.. But I went with sixes.