Depends on what you intend for the rifle, really. If it's on a bench it's whole life, punching paper and steel at long ranges, that's one thing. If it's your hunting rifle, and you have to lug it around the mountains, that's another ballgame.
Weight tames recoil. Well. And it's simple to set up,with common components.
Lightweight schit has it's own issues, and it's mostly tuning. You have to tune all that stuff to the load you're shooting, and alot of times, it won't work with other loads, as effectively.
Your call, honestly, based on intent for the rifle.