Is it better to get your hair chemically straightened or to straighten your hair daily?

i have hair that curls and frizzy and poofs out. i straighten my hair but it kills it, so i tried using gel when my hair was wet and blow drying it straight but that still didnt work for me. i really want a way to straighten my hair without killing it and i want it pin straight, but i cant seem to find a way. So, i wanted to know if chemically strtaightening your hair didnt make it look so dead and stringy as using a flat iron on your hair? helppp pleas this is really important to me :/