What decks are you familiar and good with?
How experienced of a player are you?
Whats the format? etc.
A typical midrange druid is pretty easy to play.
Zoo is good if you aren't comfortable with Handlock
Dragon/control and Grim patron Warrior are both strong right now, but i wouldn't take them into a tournament without practice.
Theres also a new hybrid hunter list that is supposed to be pretty insane right now.
https://tempostorm.com/decks/rank-1-legend-na-protohypes-midrange-hunter