- Which one has the best durability?
Both are considered to be on the more durable side
- Which is the lightest?
Both are very light, probably about the same weight
- Which one is the softer?
LTE, no question on that one
- Which one is best and why?
Personal preference, LTE if you like a soft ski that can still hold up on jumps, S4s if you wanna go fast, pop hard and like a stiffer ski
- And which one will hold up in high speed/charging the best?
S4
Hopefully that helps out both of you. It's a tough call between the two. If I had to pick (and I've ridden both the S4 and the Phil Larose (which is similar to the LTE)) I'd probably go with the S4 for their responsive snap and the stability they have, not to say the LTE isn't great, I just personally like the S4 a bit better.