Anni style is kind of retreat.. not a tourist destination (usually) and in a cabin where we cook for ourselves and have dormitory style rooms usually.
Fall Ball style is more of a tourist event.. last year we were in Dublin, for example, and got to explore the city. It's less structured and only a single meal is included.
To quote myself after every event announcement(!), I will certainly be looking to attend but it will obviously depend on dates with my ridiculous life of not getting to choose when my leave from work is.