Bitless vs Bit

Not sure if this should be under training or her. I will be starting by 2 yr old tacking and possibly a light ride or 2 I want to use a bitless bridle but am not sure if that is best as compared to using a bit I have always trained and rode with a bit. Until last year when I started ridding a mare with a bozel (not sure how to spell it) she rides great also do the show rings accept the bitless bridles or does a horse need to have a bit?