I went with a Pico4U because it's a lot cheaper than Pimax, is reliable, has better visuals than my G2 and has a the Broadcom Snapdragon XR2 processor so that some of the post processing work can be offloaded to the headset rather than being done on your PC GPU. Crystal Light has better resolution and wider FOV but, given the GPU offload to the headset Pico4U, I'm going to guess, with no supporting data, that I'll get better latency and frame rates. E.g. where we have CAS and HMD scaling in the game. Leave CAS off and HMD scaling at x1.0 and let the headset do this in it's own processor. Crystal Light can't do any of this AFAIK.
BTW, IMO the Crystal Light is a great headset and I've been a supporter of Pimax since I backed the 4K in 2016. I bought a Pico4U over the Crystal Light because I couldn't get a Pimax Crystal Super. Plus the Pico4U can do a tonne of other stuff that the Light can't, however I won't go there as it's not ED related. Pico4U has great tracking and doesn't need base stations unlike the Crystal Light but for the Crystal you can buy an optional eye tracking add-on ( I think ) whereas the P4U cannot do eye tracking. The Crystal will also do 120Hz as opposed to the Pico 4U's 90Hz but good luck getting 120fps in ED VR.
Pico 4U happily uses wireless with no addons but also USB-C, both of which are less cable weight than display port. If you really want, you can plug pretty much anything into the USB port, storage, power, power+streaming.
Also, my Pico4U is BT paired to my Bose sound system so I have both the directional sound from the headset and ambient sound from the speakers at the same time. I don't 'think' the Crystal Light can do this.
I could go on. In short, for the extra cost IMO, the Crystal Light isn't even slightly worth it over the P4U and loses too many features.
However, that being said, as soon as the Pimax Crystal Super is out, I'll have it.