Yumemiru is a must ofc. I've wanted an updated version since I got into S/m. That'd be nice ^.
Ahhh omg but the live 9nin version of Chikyuu wa is incredible DX
Were the lines re-distributed though? I can't remember. I can't remember the performance lol.
Well if it had to be me I'd go with my fave songs, since they'll probably sing those chosen in the future, pretty much at least 1 A-side since Yattaruchan. (Mystery Night, Ii Yatsu, Chikyuu wa, Yattaruchan). This last one would be good since it's Maro heavy. At the same time lines completely re-distributed means some members could get some epic lines as well since Maro had those. Some others might be just one member o 2 taking Maro's lines. Chikyuu wa would be interesting to completely re-distribute since it is basically Take/Dawa but I like it that way lol.
Chotto matte kudasai would be good. There's also one from last concert that I never remember but Kanon, Dawa and Take sing the same line that has high notes and Maro is just so flawless. I'd like Nee Senpai and Otona no Tochuu.