What programs have B teams at this age?
Not trying to rebels out this post, but the rebels two B teams are both very good. Rebels Raiders are best "B" team around have beaten all the other B teams, and a few of clubs top teams, they are more east ended. Rebels Riot are central and very good as well in terms of skill. Great set of coaches on both those rosters.
Legacy has a solid B team, Mooselax only has one team but solid B team.
For Central location would look at Rebels Riot, and Mooselax. For East end would look at Rebels Raiders and Legacy B.