Tecton X 3 by HOKA — Used these for many of my longer efforts including a long FKT attempt and a 50k race.
A really well cushioned and forgiving shoe, I have found it works for everything except for the most technical terrain. My foot moves around a little bit in the shoe due to the sock liner design, but I have a low volume foot, so I deal with that in a lot of shoes. Overall a really good shoe that has some versatility. If you could only have one shoe, this would be a good do-it-all option.