Looking to join another world, I have never participated in either of these 3 and wanted to know if anyone had any advice on which one to join. Looking to move to D one quickly. Thanks in advance!

Iba is one of the worlds I am in, and it probably has the best D2 out of all of them. D1 isn't bad, and the ACC isn't absolutely choking the life out of every conference.

Crum I have no idea.

Allen seems to have them most evil, vile ACC lol. It's ACC is TOO dominant, in many people's opinions, but could be fun to try to get into.

Iba DII is awesome.

Allen DII is awesome if you are in the Gulf South, and Allen DI is awesome if you are in the ACC. Both are completely dominant conferences in their respective divisions. 

I'm in Crum, and there's many fine coaches, but I don't find much that is super-special about it. 

I would go with Iba, and go to DII as fast as you can. Lost of parity and excellent coaches and conversation. 

I'd avoid D1 Allen, the ACC is dominant, very hard for other teams to win. But if you want a challenge once you are in D1, go for it.

I liked div II and div I IBA. It was very balanced and fun. In div I iba you don't have just your big 6, so you got a shot to get into a mid major and have a big head start with the recruiting bonuses some confs get. 2 non bcs conf are in the top 5 there, so it just shows that the top end isn't all that dominate. One has 2 sim ai and a human with a 200ish RPI. The other has 4 sim ai and a 275 human. Its nice to see the smaller schools at the top, even with sims holding em back. 

I go with Iba, too

can't speak for the D1 thing but I'm enjoying D2 Iba the most out of any of the worlds I'm in by a pretty wide margin

ACC has won nine of 12 in Allen (with Kansas winning two of three others) since recruit generation changed.  Unless you want to bang your head against a wall, I'd stay away. 

Crum, OTOH, has seen six conferences win the last 11 tournaments.  Much more parity, IMO. 

Allen has a bit of a different narrative in DI than the others, but you should definitely give it a whirl.  Plus, you're not going to make it to DI for another, what, seven or a eight seasons?  So it might not stay quite the same.  Or, yes, it might get worse.

Iba DII is completely awesome. Do it.