How should I spend this currency

I highly believe that the SSR dupe and chaotic cristal is more interesting that the tickets, but as the ticket are monthly resetted do you think we get enough medals to get the tickets in the first place and focus on the 2 rainbow lot at the end/beginning of next month ?

Or should I just focus them in a first order and get the ticket once these two prize are sold out? Do they ever come back btw ?