Franchise!
It's a really good mix that suits me very well, especially because of the online features; Conversation Points, dynamic player market, communitychallenges, having the possibility to give avatars a high five

Further cos I enjoy it to progress from a zero to a hero and I like it to build/buy stuff with self earned money only. Not sure when or if I'll ever find the time for career mode
After ~24hours with my franchise I have only 3 public habitats so far because I'm loosing myself in details while building/trying (good things need time!) and because I wanted to know how far I can get in the community challenge. There exist 3 more non-public, very expedient habitats... Or better said breeding machines ;-) Means my franchise the last days consisted of building complex habitats and breeding tigers

The last named was worth the effort!