LSS can be very light and very minimal. LSS fore end is in my view barely functional and hard to grip in any reasonable manner. LSS XL fore end is significantly more metal and size weight.
ESS is the other side of the spectrum - a lot of material a lot of curves and shapes, significantly nicer to hold of hand, but visibly heavier. If you are going to hunt and need minimalistic but rough around corners setup - LSS. If you want range gun - ESS.
Having said that, as of now, top range heavy heavy setup is ACC. Top light weight hunting is HTN26. Both are significantly better in their respective uses. If I was going cheaper I would take MDT Field with practically the same features or MDT XRS. Both LSS and ESS are a bit outdated for what they are right now.