To start with, sorry for the bad pictures. Ended up giving all of them away, so I cannot do a re-shoot for a couple of weeks. 
The larger one runs five 5mm LEDs off three AG13 cells while the small ’un has one 5mm LED and runs on four AG3 cells. The large one is a reverse clicky that is surprisingly good in tactile feel and the small one is a twisty with loose threads that are triangular. There is an O-ring, though, so the head cinches tight.
Large puts out about 25 eyeball lumens and the smaller twisty puts out about 8 eyeball lumens.
Beamshots, large and small.
Side by side
While the large one is really bright and liked by non-flashoholics, I personally prefer the small one due to it’s smaller size/head and large hole which I prefer to slide into keyrings directly. One always has a brighter light at hand if more lumens are needed. 
Also, the small one comes in various colours (that seem painted on, rather than anodized, I dunno really, but they’re really flaky) that almost always interfere with conductivity and need cleanup on the rim of the battery tube. I found the unanodized silver version the brightest and best put together of all.
Bought them from here:
EDIT: Forgot to mention that the small twisty comes with colour-matched spring loaded carabiners!