if Dhalsim spits his giant fire ball at you, can you use turn punch right as he teleports behind you and release to face correctly and smash him?
most likely, auto-correct headbutt is much safer than tap. Use HP tap though, just like Guile’s sonic hurricane, the forward range of the HP.hb will avoid the ultra all together.
Tap is more unsafe because the invincibility frames shouldn’t avoid his ultra all together because it moves slow and has a large area. This is mostly theory, but should be right. Training mode is your best friend.