SPECTRUM KING 400+ vs ChilLED gen 2 600w?

SPECTRUM KING 400+ vs ChilLED gen 2 600w? which would be the better option
I'm planning on putting 2 of either one in my 4x8 tent.

Im confused on whether the spectrum king is outdated and if the ChilLED is overpriced

Ive never heard of the ChilLED but I have always heard great things about Spectrum King

Where's the UVB?

What chips are they? What drivers?

Expensive and make too many claims....