Who art thou that judgest another man's servant? to his own master he standeth or falleth.
God is judge.
Let every man be fully persuaded in his own mind.
He that regardeth the day, regardeth it unto the Lord; and he that regardeth not the day, to the Lord he doth not regard it.
He that regardeth the day, regardeth it unto the Lord; and he that regardeth not the day, to the Lord he doth not regard it.
Paul isn't saying both choices are correct. The truth is the truth. We will choose to regard it to God or not regard it to the Lord.
Like any truth we can choose for ourselves to obey it to God or not obey it to God.
Eg....Be fully persuaded about homosexuality in your own mind as to if you accept it or not.
The truth will set you free.
Some topics are not salvational. Like today getting the vax or not getting the vax. Be full persuaded in your mind as to if you get it or not.
It's not for me to judge you or force you.