Multicasting : QOS

lets say i have to stream 9 at the same time on a switch , the question is : should i stream all these channels on single multicast ip and diffrent port OR
should i stream them ,each on diffrent mutlicast ip and diffrent/same port :
scenario 1 : Ch1 : 225.5.5.12:22222
ch2 :225.5.5.145:23232
or
scenario 2: ch1 :225.5.5.12:12421
ch2 :225.5.5.12:24444

which is better and efficient ( lower network usage )