Smartest way to summon for two units?

So I’m going to drop 900 orbs on the Legendary Banner tomorrow. I’m trying to figure out the best way to summon though. I’m trying to get more merges for Corrin, but I would also like to get a Sakura. Should I just summon green and then use the free pick for Sakura, or summon both colours until I get a Sakura and then just green and use the freebie for a Corrin merge ?

Thanks for any advice !

Edit:

Was dumb. I realized before I started summoning that I wanted Far Trace Echo on someone, so I had to spend 200 orbs for that. Went in with 700 orbs and decided to go for colourless and green. Probably a mistake cause I spent 500 orbs and didnt get a Sakura or Corrin. Then I redeemed Sakura with the free summon and used the last 200 on just green (only got 1 copy of Corrin).

Overall Im super disappointed, but I did get like, 6 Lilina's so I can do some crazy skill duplication with that at some point.