I think you are down to personal choices here, pick out the features you desire the most.
I don't think anyone is going to have a wide grasp on all the new available laptop LCD panels, chassis, batteries unless they own a repair shop. But these aren't the kind of machines that typically end up in direct consumer hands. Large companies are only going to pick a few chassis and are often warranty/contract supported so even the onsite technicians don't get to work on them.
Battery life on a high end mobile platform shouldn't be much of a factor. When you use it for heavy work, it should be plugged in. It won't perform nearly as well on battery anyway (and if you set it up to do so, then your battery life can be measured in minutes) If you need extended battery life, I would look into an extended battery, which is going to be quite expensive.
I recommend Dells and Lenovos because I have personal experience with some of their recent models. Never did get my hands on HPs version of a mobile workstation, but that is a whole other story. I don't think ASUS or MSI were considered due to a lack of enterprise level agreements, but I would have liked to see what they offered. I have seen a few vendors come in with ASUS hardware.