Congrats!
I will start about this topic. It doesn't state crystal clear (and maybe on a bigger font too, heh) if this is only questions or it's the actual raffle.
I do think that it's just questions, but stating that has a good chance to not get this topic filled with people's wallet addresses 
Then I'll state something you may actually know, you'll have to put the actual raffle in the correct sub.
I understood it's also the raffle, not just question, only after the topic was moved to Games and rounds; hence my correction.
The tool to be used - imho both are just as good. Using one or another is a matter of preference, mostly for the developer.
On the prize - it's really up to you. It's, after all,
your money and
your party, do it in a way
you enjoy it.
(2x 5$ would made 2 people happy though)