I'll probably go with a stupid half-orc barbarian that smashes everything first and asks questions later - I plan to play that character till I die and never revisit it again.
After that I might go for wild magic sorceror - those are always fun - and play that one out till the end.
Now...on the other hand, from the trailer it looks like Giths are dragon riders, and if our character can get a dragon later in the game as a gith, well easy choice. but I doubt larian will do that unfortunately.
I feel like the saying "be careful what you wish for" is appropriate here: the "easy choice" there just means either you're completely overpowered, since you have a dragon at your beck and call, or the dragon won't do anything for balance reasons, meaning it feels pointless/weak.