Are NUX Looper pedals any good?

Yes they are! Like all NUX pedals, their Loopers are built to superb quality with top drawer components and outstanding performance and sounds throughout.

Which NUX loop pedal is the best?

Best is a subjective term, but the JTC Drum and Loop PRO Dual Looper Pedal is easily NUX's most feature laden looper, while maintaining the ease-of-use that's indispensable to any great looper pedal.