Tula or ergo or baby Bjorne?

I'm purchasing my baby carrier in the next few days and I'm really liking the ergo baby but then people talk about Tula and I'm not getting it? Why is Tula more money first of all it only offers two wearing positions while ergo offers 4 and it doesnt look as modern as the ergo does. I would greatly appreciative feedback as I want a super carrier that I will not regret I plan to carry my son a lot and want something super comfortable for the both of us for a long time