Why you're making multiple post with same question.
If you cannot use the google, then forget about whole mining.
And do you know why you didn't found any comparison, because you wasn't looking for that,
you just waiting till someone will do that for you, that's why you didn't find anything.
Another lazy ass. And your electricity isn't free, you're just a thief and you're rant with that.
That's my thoughts...
Umm.. no my electricity is free because i live in a dorm for school, im not a thief lol you have a cofee before you awnsered me? the reason for multyple post is because im not sure where to post in altcoins not use to these threads, and o cant use google.. noo you idiot! i wrote a post here insteasd of typing mining comp in too google, i want you to do that for me.. jeesus.. lol want to build my rig while im at it too! since im soo lazy?!
For how long will you be staying there ? If it's more than 6-7 months go for 390s. You will most likely hit ROI by that time but take note that after that when you move to your own place your electricity bill will be very high and you will make much less profit than some cards like rx 470. And 390s are harder to sell after you are done with them so take that into consideration too.