I have several KFs, of differing manufacture. All work well. And one Lemo, which also works well.
If you're wanting to push a lot of watts, the Lemo has more potential airflow, so may be a better choice.
But if you're not in that camp, the KFc's (clones) might be a better choice. As said, a longer history, so more tips around on dealing with any issues.
Conversely, the Lemo comes stock with a pyrex tube, and the KFs are either all stainless, or poly, which can be a problem with some flavors. But taking off the bottom / base ring to adjust airflow is a pain....