I personally think all will be good dragons: Jarl and Surt.
But I want to see if Festive is worth getting. If it’s a Hunter I’ll probably get it since Hunters are my second favorite, first being Sorcerer’s. If I had enough rubies to get Surt I’d get him without hesitation but sadly I’m stuck with Gunnar/Björn and Festive/Hilder this season.
Since we don’t have discount on wave two I’ll just wait till festive dropped to see what my options are. If wave two was discounted I’d absolutely get Jarl.