It's often quoted that the LX angles are not as good. Not untrue, but there's more to the story. Only the approach angle is better on the LC. Every other metric: departure, breakover, wading depth and potentially sidehill, give the nod to the LX, on account of the 3" lift and lower on demand. There's also differences between the model years.
Table copied from here
KDSS is a double edged sword in itself. It's the single largest impediment to LCs not being able to drop in the larger and wider tires that the LX can fit. It's also a passive simpler system of cross linked suspension control. The same technology but in a more capable active and adjustable form exists in AHC.
With AHC lift, larger tire capability, it's arguable whether bumpers even are necessary. I'm on a 6" total lift with 35s and mild AHC sensor lift. All while being dialed whether carrying nothing or 2k lbs. Not much comes close to touching the bumpers. To state it more concisely, an LX would be capable of tackling difficult rated trails with nothing more than just dropping in big tires. That goal and build path is much more costly on the LC.
That doesn't stop the LX from getting armor. With the cost and effort saved elsewhere, most aftermarket bumpers can be fitted with some mild customization as many examples of LXs have shown.
Separately, there's a laundry list of details differences (varies through model yrs) that the LX gets over the LC.
Copied from here
1) More sound deadening (acoustic glass, engine covers, more extensive interior insulation)
2) Powered rear hatch for open/close, also key fob operated (later LCs got this)
3) Soft open rear lower tailgate, with power latching
4) Surround camera system
5) Ventilated/Heated front row (later LCs got this)
6) Mark Levinson
Reference (only other model to get the Reference system is the LS) w/surround (19 speakers vs 14, 10" sub vs 8")
7) Power side view mirrors with auto-fold (later LCs got this)
8) AHC - AVS, lift on demand, adjustable and continuous damping logic, anti-dive/roll/squat, leveling, etc.
9) AHC underbody armor
10) Shorter roof rack (LC has a longer roof rack with 3 supports per side)
11) Steering headlights (AFS)
12) Projector headlights ('16+ LCs got this)
13) Headlight washers
14) Storage in rear seat armrest
15) Power slide rear seats
16) Second row storage on front seatbacks is a panel vs net
17) 14-way adjustable driver seat vs 10-way LC (passenger 12-way vs 8-way)
18) Adjustable tilt front headrests
19) Power stowage for 3rd row seat
20) All windows down by holding remote door open button for 3+ seconds (not sure Toyota's have this?)
21) Substantial Lexus key fob
22) Fade-To-Off interior lighting (I believe LC got this in 2014?)
23) Puddle and side step lights
24) Door sill lighting
25) Interior ambient lighting
26) Additional trunk side light and open tailgate lighting
27) +2hp / +2tq (requires 91 octane, LC is 87 octane)
28) Semi-aniline leather and more luxurious interior appointments
29) Ventilated second row outboard seats
30) Four-zone climate concierge
31) LED Headlamp with AHS Sequential Turn
32) LED Cornering Lamp
33) 12.3-inch high-res split-screen display (LC 9")
34) Head-up display
35) Steering wheel paddle shifter
36) Door puddle projector lamps
37) Rear door retractable sun shades
38) 2020 gets special trims: "LX570 Sport" to "LC Heritage"
39) Dual screen rear entertainment
40) All-Speed Dynamic Radar Cruise Control (LC DRCC for 25mph and up)
41) Auto air quality air recirculation