[Masterless]

I can't speak to the KWA, but I've owned KJW pistols.
The TM are nice build, but their pistols shoot very soft. I got a KJW P226 (full metal) and it's a good pistol. Shoots pretty well stock, but: KJW mags are crap. They leak no matter what, and when you're shooting a lot they just freeze up and dump your gas.
I replaced my KJW mags with the new TM P226-E2 mags, and they're amazing. WAY better thermal performance, and much better quality too. I really like them, and they've totally changed the way I can use my pistol.
So, IMHO, KJW full metal pistols are good, but you have to at least replace the mags to get solid performance out of them.

I haven't heard much about KWA, personally, so I couldn't advise there.