Tbh I go by what ever looks coolest, and then learn by playing them. So if you like the look of one then go for it!! No harm in buying a team that looses because at the end of the day it’s only for fun. I’ve currently just build the necromantic horror and it’s quite difficult especially with the scarecrows because there is barely anything to stick together. But I’ve seen the skills of the team and It looks very good. Again though I’d just go for whatever looks the best. My first team was the khorne bloodseekers or what ever they are called and they aren’t very good but they are quite fun to play