Seems like a trick question since both isn't easy but always choose which will provide you inner peace. If you hate someone, try forgiving him/her. It doesn't mean to say that you should love him/her again. Focus on your self- self-love. If forgiving that person would provide you a good sleep every night, then so be it. Because at the end of the day, everyone likes to lay down in their bed, not worrying about something or someone.
so if you're asking which is easier, those two cannot be defined as "easy".

Any thought about this kuya @suteru?