Usually having a combination of Anubis/Anubis is more damage, but Aratron/Anubis isn't far behind while also netting tons of HP.Them guarantee SSR Kamihime gachas are available once a month, so you'd need to wait three months for that.
I don't think there is a sure bet to this question. If Cerb-Nidd was available in the ticket, then certainly those. But with Beli-Anubis... well, if you like Light/Dark, then I guess Managarm/Anubis is fine? Since you're basically not pulling those from gacha, while you will eventually pull SSR Himes.