Okay, maybe “wars” is over the top. But nothing whips the Blythe community into a frenzy as much as facemould talk.

Blythe has had four incarnations since Takara started reproducing her in 2001: BL, EBL (AKA Excellent), SBL (AKA Superior), and RBL (AKA Radiant). Although they are all based on the original look of 1972 Kenner Blythes, each Takara mould gives Blythe a slightly different look. Indeed, people new to Blythe have trouble telling one facemould from another. More militant Blythe fans, however, reject certain moulds completely and embrace others, which can result in the occasional personality clash when someone feels as though their favourite mould has been slighted.
The BL and EBL looks are based on the same mould, but the finished dolls are distinct from one another due to the different thickness od their eyelashes, and the boggled (lifted) eyelids, fuller lips, and matte faces on some of the BLs.
With their extra-wide eyes and round cheeks, BLs are sometimes described as childlike or quirky. Being the earliest Takara Blythes, they’ve become harder to attain, and therefore have become widely coveted for their rareness and distinctiveness. EBLs have a more serious look, and their mouth shape is the least “smiley” of all Blythes, making them popular with collectors who prefer more melancholy girls.
Below: a Kenner Blythe (left) and a BL Blythe (right). This particular BL (Aztec Arrival) doesn’t have the matte complexion, pouty lips and boggled eyes of found on some BLs, so the differences between her and the EBL pictured lowered down are less pronounced.

Below: a Kenner Blythe (left) and an EBL Blythe (right).

SBL (or “Superior”) Blythes began production in late 2003. The SBL mould, is, anecdotally, the least popular of the Takara moulds. SBL Blythes are sometimes described as having a more sophisticated look than BLs and EBLs and have less rounded eyes, a more noticeable smile, and a different eyechip style. They also have thicker eyelashes and a more extreme side-glance than EBLs. More recent SBLs have a new style of lip that is even more smiley than the earlier SBLs.
Below: a Kenner Blythe (left) and an SBL Blythe (right).

SBLs are still being produced, but in 2006 added another facemould, RBL (or “Radiant”). Presently, Takara and CWC alternate production between the two moulds. The aim with the RBL mould was engineer a Takara Blythe that looked as much like a Kenner Blythe as possible. RBLs have especially large eyes which are slightly uneven, which is apparently a deliberate quirk meant to echo the imperfections of Kenners. They have a soft smile and a fuller face than SBLs. RBLs are sought after because of their resemblance to Kenners and relative scarcity compared to SBLs.
Below: a Kenner Blythe (left) and an RBL Blythe (right).

I’m sure I’ve left a lot out, but this is my impression of the various moulds! It would be great if you could add any extra info in the comments.
All photos by Sue.