I tried one of those alleged 'kayfun killers"... the smok RBST or RSBT... not the RSST. In a word... nope. It vapes more like the smok Caterpillar, really open and airy, and it's a massive .... pain to build *just right*. It's in the drawer along with the T3S's and Mini PT II's.. and Caterpillar.
The only thing I've tried that can challenge a well-built kayfun for flavor is the Magma, I really like it. The Veritas... jury's still out, but even with the airflow as closed as i can make it, it still seems too airy to me.
Andria
You bring up a good point, Andria. Tootle puffers are different in many ways; including their preferred draw. My ProTank 2 w/AFC (v1) has a looser draw than my KFL+v2. Both have been opened up as far as I can take them. IMO, that's one of the "cons" against the Kayfuns; their (overly) tight drawl. I know there are many who love the Kayfun's draw. Many authentics and countless clones have been sold. If you like a tight drag that can closely mimic the experience of an analog, it's tough to beat a Kayfun. If you enjoy the draw off of a wide open Nautilus Mini or airier, look elsewhere.
ETA: I like both my IGO L and Veritas wide open. The Plume Vail, I tighten down quite a bit.
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