I'm no guru, nor a breeder. Just a hobbyist who has kept various CB only cham species for a long while; different locales of Panthers (Ambilobe, Ambanja, Sambava, and a couple of "mutts") along with a trio of Veiled's (bred), a single male Meller's for nearly 10 years, and a Trioceros quadricornis.
While I would have LOVED a Parson's, that one was always a pipe dream; very hard to come by and difficult to justify financially when I have other bills to pay, lol.
I don't really know how close they come to Parson's relative to husbandry, but if you are looking for a nice large cham, then maybe a Furcifer oustaleti would be good. But again, hard to find CB and I, as a personal choice, don't wish to further the WC trade by any purchase.
Good luck ... hope you find that perfect cham. Me, I'd love another Meller's.