You can do it however you want but the best way to do it by far would be 1 ticket in each of your names.
If you do 1 ticket each, then each of you gets your own perks... e.g... a $200 gift card, free surprise gift, etc. One year they gave out free jerseys. If you each have your own account, you would each have gotten a jersey, but if you put 2 tickets in one account then you would have only gotten 1 jersey to share.
Also, if your friend and you ever become "not friends" then you can keep your ticket and move it somewhere else.