Haven't used the Russian, but I just got a
kayfun Lite yesterday, my first Kayfun of any kind. To me, it's the absolute epitomy of my
vaping experience to date. I built a 1ohm coil with a super 8 regular silica wick, threw in some Midasvape Toffee which I also got from Vaperev, and had the absolute best vape I've ever experienced. The performance, the lack of any leaking, not one dry hit or gurgling in two tankfulls so far, all make this atty well worth the $110 I spent for it. Most importantly, the flavor intensity is off the charts. And that was with just a normal ol' coil and wick quickly put together (built with not the cleanest of hands in the world either, when will I ever learn?... damned wick was frayed and disheveled and dirty all over the place). I can't even imagine how good it's gonna be with some (clean) Ekowool preped with a little more care than this current one, and/or with a micro coil setup.
Sorry I can't offer a comparison between the two, but you definitely can't go wrong with the KL.
Btw, you guys who liked BWB Malty Toffee, but have always opined that the flavor was just too subtle to be enjoyed to its fullest, try this Midasvape Toffee. It tastes very similar to MT - buttery Skors bar or Heath bar, but the flavor is vastly more intense... no subtlety about it.