(Spoiler to save the space...!)
HIGHLANDERS
ORIONS
HUNCHBACKS
JENNERS
Okay, I'll put my opinions of them under categories.
Highlander IIC
- Slightly Taller than the original.
- Higher mounted weapons (On the arms and LRM hardpoint)
- Slimmer back
- Shield Arms.
- Feet are the same.
- Stands up straighter.
Orion IIC
- Under slung ballistic placement.
- Leveled and less protruding Torso alignment (like arctic cheetah, and I called it, I'm so happy for it!!! ...And me for calling better hitboxes )
- Higher mounted missile hardpoints (Arm and torso)
- Longer pelvic torso
- Feet are the same.
- Same height and legs (When I say legs I mean same sitting height)
- Shield Arms(?) (Only can see one good one as of now)
Hunchback IIC
- Taller Hunches (Gun mounts), more mass overall
- Straighter arms
- Lower sitting stance.
- Possible Hunches that block POV(? I watched stream, but couldn't tell if they did that)
- Fuller Legs
- Slimmer back
Jenner IIC
- Chicken legs!!!
- Fuller legs
- Similar height
- Shorter Center Torso
- Slimmer back
All in all, the best mech out of all of them for hitboxes may be the Orion IIC, which I've been saying for quite some time. Those torsos are SLIM, like the cheetah :-)
The best mech that got a upgrade in height was the Highlander IIC, with better weapons placement, and the Orion would've gotten this if not for its low gauss rifle placement.
But, all of them now don't have backs that stick out so that the enemy can't core them from the front by hitting their rear anymore.
And the Hunchback IIC's height, those legs are squat, really squat. Guess somehow the IIC version of the hunchback is taller than the IS one, didn't know that (It's been to long).
9/10 for the awesome changes PGI, -.5 for the Orions low gauss placement, and another .5 for the odd hunchback IIC ride height. But that's all the things I don't like about it!!!