My guess is it's a personal issue, which is crucial when it comes to discussing ergonomics. If you haven't done so already, be sure to sit on both and find out what works for YOU, not for someone else.
Some people complain on the LS the cab doesn't have quite enough head room and the cab is a little more cramped. This was a plus for me. I'm 5'10", and don't need a lot of space. Instead, the lower cab allowed me to size up and get the XR41XX series which fit in my garage.The T454 was a couple inches too high. Otherwise, I may have ended up with it.
Again when it comes to ergonomics, find what works for you, not, someone else.