Do you buy new Phone or change Battery?

Do you that type of user who buy new phone or use a phone as long as possbile and change your batteries maybe use custom rom as well

i use that latest note 4 with a cutstom rom on it and can change battery easily because its possbile and allowed
and i have the google pixel 4a 5g its closed cant change battery easily but its much faster and smoother better rom and camera as well
dont know if i should keep or sell to buy a newer one next time..