I love my full suspension but have a bad back and live where it’s rocky. Age doesn’t help. If young and have a good back stick with a hard tail. I’d also suggest a 27.5 at your height. I weight just 5 pounds more, nothing will break. Bikes are built to handle heavier people. Broke 1 chain in 59 years of biking. You will always find better deals with used bikes but it helps to have someone with you who can point out the good and bad parts. Look for a bike with progressive geometry. Stay away from 26″ wheels, big penalty in what it will roll over and speed.