It's hard to say whether or not you want RGB or white LEDs without the model numbers of the displays. If I understand this distinction properly, some "white" LEDs consist of a R, G, and B LED that, in combination, produce white light. The regular white ones are something like blue LEDs that use a phosphor to convert the blue light into a wider spectral distribution that's closer to white.
From the viewing perspective I'm not sure how much 6500K matters, but it matches the default white points of sRGB (for example) so should in theory, I guess, lose less information during color management. Also, I think most typical sRGB monitors tend to be optimized for 6500K as their "native" white point. 5000K is recommended for prepress because that's the 50D standard that's used for viewing booths and everything else. Of course if you're doing prepress or otherwise need D50 for some reason then you'll already know that and so probably don't need to be told.
Thing is though that the white point of ProPhotoRGB is D50 (5000K) which might mean that 5000K is better if you're using Lightroom, but I don't remember if MelissaRGB (Lightroom's internal version of ProPhoto) differs from D50 or not..... If anyone knows please tell me, and let me know how much it matters to use 5000K with lightroom if so.