Mine is Niederhäuser Hermannshöhle Spätlese https://www.doennhoff.com/#!/en/lagenweine/hermannshoehle
It depends entirely on which type of Riesling you prefer, Donnhof makes a huge range over many sites, his "empire"expanded when he purchased several of the old Staat Wiengut properties on the Nahe, initially the rise in quality was noticeable but for me Donnhof plateaued a bit after that, but has returned to the very top flight in recent years.
I no longer at this moment have any apart from a couple of bottles of the Schlossbockelheimer Felsenberg Trocken in my cellar as my tastes have changed away from those wonderful top end Ausleses as they have become very much one glass wines so my inventory of those is going down and the drier wines is on the rise. From earlier drinking the site you mention was superb back in the late eighties early nineties and the last bottle from there was a '90 Auslese Goldcapsule one of Germanys top Rieslings, today by all reports the winery is back on top form but times have changed and many young winemakers are making their mark in all the regions now, those glorious old estates have got real competition.
The Norheimer Dellchen and Oberhause Brucke sites are not far behind and in some years edge Hermannshole.
Haven’t drunk enough of them to be a real expert on this producer but I have noticed considerable differences between vineyard sites. Donnhof do seem great at expressing the differing characteristics of individual sites, have yet to have a disappointing wine from them.
Not one of their top wines but have really enjoyed the dry Tonschiefer 2011, the 2007 Schlossbockelheimer Felsenberg Auslese and this (which really did have a hint of cherry, just like the Von Hovel Scharzhofberger Kabinett tasted of blackcurrant):