Depends what your breeding for. The healthiest pigeons will naturally mate breeding together leaving weakest. This works good for homers of all same caliber, and rollers of all same family line and past proven good pheno and Geno type, and show birds of same quality. Just depends what you want out of your birds vs what they carry and show, and their families showed and carried. If show birds, look up standards, take note and measurements then breed towards standard (if it's what you want), or breed for what qualities you enjoy or/and want to keep and enhance.
Good luck and keep us posted.