They are, and some people have opinions about the matter; but I have the FC200R (Leopold) and the Majestouch Tenkeyless (Filco.)
Overall, it's more or less the same experience with a slight difference in keycaps because the Filco's have a coating on them that makes them get a shine to them over time that is very uneven and ugly. Though if you were to c hange the keycaps the difference would be almost O
The Leopold's also have a better Key Rollover on USB (17 vs 6)
As for the keycaps, the Leopolds stock caps do feel nicer and thicker than the Filco's stock caps. You can always customize the keycaps on the Filco, however. It's harder to do so on the Leopold because the it's spacebar's stabilizers are spaced differently than filco/das/ducky. Many custom keysets have their stabilizers made to be compatible with those brands.