Hello kind veterans. This is not strictly a MT question, but still on the potential KH gain.

My current roster includes Michael, Sol, Vishnu, Takeminakata and Metatron (plus main supplementary SRs). I have a stock of gems to use on chance up and I wonder if I should try to get Iris or Tishtraya, who will have chance-up later this week?

While giving my best shot, I will likely fail in getting either. I'm also likely to buy next MT, since this is a thread of that. And the question holds - which one of those to get in that scenario? Or maybe Lugh?