I have also heard that modern pads do not need gas evacuation... but I have also heard that even race pads can overheat and still produce gas and "fade". It's just much harder and takes a lot more heat with modern non-organic mixed compounds. OEM style organics and organic/metallics (like EBC's green pads) can still fade at lower temps, but grab much better when cold which is why they are good for street driving. I've used EBC greens and found they were great for everyday driving in Michigan winters, but couldn't hold up to a summer track day. I use Hawk HPS now for street driving and HP+ for track days.

Even without much gassing problems anymore, I've still heard some companies claim cross drilling improves cooling. I just don't see it though since most of the cooling is down by centrifugal force pushing air through the cooling vanes in the middle of the disc. And the cross drilling does compromise the rotors metal structure unless they are properly temperature treated. My personal opinion is slotted only is best for performance because the slots clean glazed material off the pads so they always have a clean surface for better friction. Downside is more dust and faster pad wear. The OP won't be seeing any performance use of the brakes though which is why I said stick with oem.