I havent played in a year or two (back when Ninja and Mask change were top tier) and just came back. i have hella. I playing sylvans right now and building Blackwing deck. I have so many tickets I dont know what to do.
Just don't waste Dream Tickets. Use them for old boxes or if you're F2P for Structure Deck cards.
There's no right answer. Just get anything you want.
The most optimal choice should be the one card you need to complete your deck.