Will you hear a difference moving from a Mac Min? Yes, absolutely huge. The difference between a Zen Mini with LPS and the Zen is still noticeable and, as already stated, if you aren’t going to use the DAC in the Mini then you don’t need a Mini. I absolutely agree though that the Zen is the sweet spot in the range. Roon is a waste of time with Innuos products unless there is something in the functionality you absolutely can’t live without. The sound quality with Sense is obviously superior.
I own a Zenith and love it. Anything you have heard about Sense relates to the first version which had a connection issue which took a while to resolve. Since then it has been absolutely rock solid. Never crashes and gets better with each version. The Qobuz integration is rather great and I’m beta testing the Tidal integration and can confirm it’s all you would want it to be.