Depending on your weight, most folk use dyneema lines, most commonly either 7/64" or 1/8" amsteel or dynaglide made into either whoopies or ucrs attached to the webbing for weight savings. A lot of folk also just use longer straps and cinch buckles or descender rings. Some use other lines and are happy with them, just gotta experiment and find what works for you.
Do some research in the suspension section and you will find all your answers and then some!!
If you are looking for weight savings experiment with a dyneema line and if you want simplicity look into webbing.
Just my opinion and my limited knowledge... hyoh, and if you are happy with what you are currently using then stick with it.