Shouta
Member
Practicing with your team is one thing but they wont have that tournament pressure, and most likely wont be playing characters that you are trying to counter at a high level either. Why not try the character you're practicing with at your local?
Yes it does make sense to try a new character that you're practicing with at finals because you will be playing against someone with equal or greater skill, and against a character you might not have the match up experience with.
If you want to practice under pressure, do it for the entire tournament or several matches in there. Sudden GF appearances of characters you don't play usually doesn't look all that good.