Just better. Trollburger is OK but I always feel like you should get more for your £9. Where as the Soujouk platter at Alushi's is massive, and tastes amazing. Only problem is you'll be belching garlic for the rest of the day.
If anybody wants decent street food (kind of I guess) then go to Alushi's under Brighton station, next to where Trollburger used to be. Fantastic, and way better than Trollburger.