Are seasonal characters put in a different queue
At character creation, you can choose if you want to opt out of the seasonal character build.
Staying it in gives you full Furious set. Opting out and taking a normal character gives you full Relentless set.
What are the advantages of picking the first version? Does it put you in a different queue bracket where you will see more Frostmourne players? More low geared players?
After creation, does improving your character change which mode it queues into?