There used to be a website for hill lists. Now possibly an app for it. Back then you signed up to the website and could see a wide variety of hill lists that you could tick off.
The benefit of that site was that it had lists of all categories and ticklists of mountains and hills. One that might suit collates hills that have the furthest distance between it and a higher hill. I think it's something like that, a measure of the prominence of a mountain compared to its neighbours. For example helvellyn might have a high figure but Catstycam being a hill off the side of helvellyn is very small being the distance to the col between them or to the summit of helvellyn. Helvellyn might be distance to Skiddaw or Scafell.
This prominence figure might be a good measure to find a hill to climb. Snaefell has a high figure being the highest mountain on IoM with next highest on mainland UK.
The benefit of that site was that it had lists of all categories and ticklists of mountains and hills. One that might suit collates hills that have the furthest distance between it and a higher hill. I think it's something like that, a measure of the prominence of a mountain compared to its neighbours. For example helvellyn might have a high figure but Catstycam being a hill off the side of helvellyn is very small being the distance to the col between them or to the summit of helvellyn. Helvellyn might be distance to Skiddaw or Scafell.
This prominence figure might be a good measure to find a hill to climb. Snaefell has a high figure being the highest mountain on IoM with next highest on mainland UK.