Dalhia can make a scary bluff and a great reducer, and although her damage is low, her 8 power + Sob makes up for it. Selma, on the other hand, has no min, so you can pill freely, and you probably want to with her 7 damage. Although her 7 power is high, most players prefer Dahlia's 8. It's your choice :O
Tyd or Andsom. My instinct would be straight away Tyd. He's better than Andsom in alot of ways, his 8 power is super strong (and Piranas need super strong) whereas Andsom only has 6. And even if Andsom does get in he's -3, your probably gonna have to pill alot anyway and it just isn't worth the damage.