Which one?

Both or whichever your friend have

Xbox is run by Microsoft, who are American.

Playstation is run by Sony. Both Sony and Nintendo are Japanese companies.

Both DLCs are good, to be honest. And seeing as they are they only two available anyway, you should probably get both. However, Mark of the Assassin is vastly superior to Legacy. While Legacy is just a large dungeon crawl, albeit a fun one, MotA offers stuff
you won't find in the core campaign or Legacy, like a handful of (easy) puzzles and a section where Hawke has to sneak through a castle (you can fight you way through that part, but you get an achievement for sneaking without being detected). They side quest
you get are also more fun than in Legacy.

Legacy>>>

But both are worth playing.

I've played both multiple times, and like both equally but for different reasons. I checked out the Angry Joe reviews and pretty much agree with his 'knocks'. While he gave KO:R, DA2 and Dragons Dogma 7/10 scores he still said they were good games worth
playing. Once I understand a games negatives I tend to ignore them, and that allows me to focus on the positives and enjoy the game more.....negatives I won't put up with would be constant CTD's on the PC and constant lockups on my 360...