Depends if I need that 1* to complete a synergy or not. Some alliances give such a huge bonus I would rush to 10 (if I have the missing character in question of course. Fuck you Mirana for being literally elusive). If I have no alliance pending and no character project (no character of which I have 2 2* copies of, waiting for just a push to reach 3*) then I guess I'd roll to 10 and stick whoever works best here.
At level 9, I would risk deciding to upgrade a character of which I only have a 2* version. The odds are just too bad.
At level 9, I would risk deciding to upgrade a character of which I only have a 2* version. The odds are just too bad.