WE P226 vs KJW P226?
 

Which one is better and why?
I can't find much on the WE P226.
I've found a lot on the KJW P226 though.

I can't give you direct comparison ratings of the KJW and WE versions of the P226.. but i do own a KJW P229 (snub nosed compact version of P226) as well as a KJW M9A1. I also own a WE baby hi-capa 3.8. I can only speak directly of the manufacturers.

All of mine are propane powered.

KJW's generally are a solid gun, for the money that you pay. WE is a bit cheap in appearance and parts in comparison. I had to spend a bit of time tightening down screws, bonding loose components together (ambi-safety) and lubricating out of the box. Never an issue with my KJW's out of the box. Mag availability should be better for the KJW P-Series, as they are fully TM compatible. I don't know if that is true for the WE version.

that in itself should give you a clue.

stick with the KJW

Isn't the KJW a bit bulkier compared to the WE and KWA though?

You shouldn't be comparing old gen WE (Hicapa) to new gen WE (Glock, M&P, XDM, PX4) which are actually made by HK3P and are much better quality, and much better, nice crisp guns in general.