best chicken crosses totally depend on what you are wanting to do.
EE's can be made by several crosses as long as one has the blue egg gene and temperaments of parents come in to play, I have an Ameracauna Rooster over Rhode Island Red hens and the EE's they produce are excellent at foraging and laying but not so people friendly like the rooster.
I tend to like the heritage breeds myself, Rhode Island Whites and one day would like to get some Buckeyes. we will have to see what rooster I get when My Ameracuana is no longer, choices would be Rhode Island White, Buff Orpington or another Ameracauna. I doubt I will get RIR hens again