A bit of column A, bit of column B. The vet suggested I keep them in both to mend without stress (they love the garage, so it's a good place to put them), and to avoid them coming into contact with the wildlife that roams my back yard late at night while they're in a weakened state.
Though it seems this advice applies more to the females. I've had them back for about an hour now, and while Poly and Phuzz are looking and acting like they've been wrung through the wringer, Pete doesn't even seem like it's phased him in the least. I guess it's because yee olde ball snip isn't quite so invasive a procedure.
I have a tragic story involving The Road. Around the same time I was gifted with these three bundles of expensive joy, my neighbors also had 4 stray kittens born on their back porch. They live a lot nearer to the street, and...well, long story short, now they only have two. Fortunately for me, the two times I've caught my cats roaming across the street were early in the morning, while the traffic isn't too heavy. But still, I try keeping them in the back yard, next to the woods, where it's relatively safer.
Though it is interesting watching experienced animals try and cross the road. My old cat, Homer, I'm fairly certain he was winged by a car once because of how cautious he was. He'd step up to the edge of the street, and look left and right a few times before attempting to cross.