1 or 4 I guess...
i don't think it's worth to start all over again, you have 2 SSR and metatron is a really nice one.. you'll find more SR/SSR for water/wind in the future, maybe light too.. and behemoth gives all those 3 teams an elemental bonus, so your account is already looking nice. just keep working on it and hope to get lucky with gacha pulls
or... hades and susanoo are nice, 2 ssr darkami, any rerolled acc with 2 ssr of same element is nice (aside of thunder), and dark is one of the more favored elements... but it's up to you really... maybe someone else have a better advice than me, but i'd stick to my main acc.. clearing events will be easier that way, so you'll get more ssr weapons, eidos, tickets, jewels, etc..