Zephyrus and Caspiel will get hit pretty hard by the Valentine debuff cap though. And it doesn't work against bosses like Gluttony who spam Atk Ups. But yes, Zephyrus is the best R Hime you can get from Gem gacha. And for now, Caspiel is the best R Hime overall (though not for long if that upcoming Fire R Hime really has -20% B debuff).

But yes, Zeph is probably a better healer than Itaqua. Just going from -40% Atk to -50% Atk is a huge gain, so despite having worse heals, she'll probably keep your team healthier.