A tripod needs to be high enough for you to see thru the camera viewfinder without cranking the center column up. Thats where many tripods miss the boat. Take the tripod height plus any additional head height, and allow two-three inches for the camera. This should match the height to your eyes, and preferably be a little taller. I'm 6ft 2, and a 67 inch tripod with a tall ball head works well.
If you are using the tripod for a telephoto lens, stability is critical, get one with a underhook and add weight to pull te legs into compression. this really helps. It also keeps your cheap tripod from blowing over in a wind gust and ruining a expensive camera and lens.