A Furch Yellow and Red series share similar attributes in as much that they are both gloss, both share the same ratio of Grover machine heads- - offering incredible tuning stability and adjustment refinement.
Red series however, are predominantly a cosmetic "next level" with greater emphasis on detailing, purfling, neck bindings, headstock bindings, more elaborate inlay work and so forth.
The red series are considered the premium line from Furch for this reason, but also why Yellow is as popular as it is too - for those who want the superior quality but are happy with the more restrained aesthetic which many (like myself) find equally beautiful.
So better? Beauty is very much in the eye of the beholder, and for some, a Blue Series is enough - but for many, the extraordinary beauty of the reds is the only possible choice :)
I'd say I am more a "Red Pure" kind of guy! Check out this one for example - OMG!