when porting a head, the bigger you make the port, the more you sacrafice low end power. If you take too much off the ports, you kill the low end power of the engine, which is the power you need most with the clone engines unless you are running outlaw classes or something like that. There is a delicate balance to how much to port a head and improve the flow. Some heads will require more port work than others. That said, to answer the OP question i like a smaller port because i love the low end power of the clones, they are great engines for the torque they produce when you have them set up right with the right mods. Just my opinions of course.
I have one engine that i was just playing around with on a yard kart years ago, i went thru several heads learning to port and polish heads, porting can be a nice improvement when done right. It takes alot of practice to get to where you can do it smooth and perfectly every time without ruining a good head.