I had a Noble for a few years- awesome preamp/tube DI.
Honestly, might be the absolute best tube DI ever.
I prefer the sound of “transformers” and not tubes. And it’s why I ultimately landed on the Mantle.
Is the Mantle “better” than the Noble? FOR ME- yes. As
@LowWay pointed out, it’s a “feel” thing combined with the tone.
My band is all inears. Haven’t used amps on stage in a few years, so I hear EVERYTHING from my pedalboard. So does it matter to FOH as much as it does to me? No. As long as I give them a good sound, that’s all they want. But for me, on stage, upwards of 100+ gigs a year, that’s what’s important.
And we only really gig from April through October, with one or two dates a month. So reliability is also a huge consideration.
Did I ever have any issues with my Noble? Nope, it was rock solid. But it’s still a piece of gear with tubes. And tubes can be finiky when they live on a board that gets loaded and unloaded from a flight case that lives in a trailer, and gets tossed around from quick setups and tear downs on festivals etc.
All that said, side by side, I prefer the Mantle. Doesn’t make it “better”, just better FOR ME.