You’re going to have to hear them, each with sympathetic speakers. What suits a Sugden probably won’t suit a Nait, and Focal may well favour the Sugden despite the common ownership with Naim, I don’t know the ECI.
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I haven’t spent any time with the ECI but I’ve owned Naim Naits previous and demoed The Supernait 3. Currently I own a Sugden IA4 which was an upgrade from an A21SE. Agree with Yeti that the proof is hearing it in your system but I can speak to them a little generally.
I would say the Naim gear sounded better with more typically sensitive speakers - 89db or less to my ear. I’ve heard them sound excellent with Harbeth, Falcon and Graham Audio for example. Didn’t like Naim as well with DeVore, Klipsch or JBL. The Sugden amps have served me well on Klipsch Heresy IV, ATC 40 and now JBL 4367 speakers. I’m definitely a fan of the class A sound.
The A21SE is tremendous so if you can audition absolutely do. I went to it from a Luxman 507ux which was also a great amp - after a side by side I could give up the Sugden sound so the Luxman was sold on. When I had the Supernait in house with the A21SE within a song or two I knew the Naim wasn’t staying.