I think it depends on the beer, style and development. I think good high ABV stouts are better aged to drop the fusels and calm the roastiness, but not all are like that. I have a case of Abyss for the last 4 years and will get this years next week. We do side by side flight of it each year. The same with some other stouts. Have done the same with barley wines and it seems to be hit or miss after a couple years. Quad Belgium's have been the same. Heavy hops in some beers like IPA's are usually not that good after a few months. Really depends on what you want and why you want to cellar. Some of ours are just to see what they are like and what is peaked. Example this year we will flight years of Firestone Anniversary of 11-18. I know from the last two years 14 seems to be ehh and well as 11 has dwindled past its peak.
On a personal side I find that my Oatmeal stout peaks at 4-6 months and is still decent after a year, but is starting to mellow to much and lose complexity. But my cream stout was much bette at a year than it was at 4-6 months.
Really look into what may last or tastes green than can be set aside for a while
I have a ton of sours that I have set aside for this.
Cellaring is fun, both for taste and experimenting. My cellar project has now topped over 250 bottles with most bottles in the 3-5 year range, some older, and some newer as they have just been released. If you are going to cellar remember that temperature control long term seems to make a difference.