There was a Borg-Nadal thread recently
https://tt.tennis-warehouse.com/index.php?threads/nadal-vs-borg-who-is-the-greater-player.587183/
Fairly predictable result to the poll, but I was glad to see Borg get a lot of support - more than I expected
My own post on the matter -
"I think Borg had a significantly bigger impact.
Borg's dominant phase is more impressive and though Nadal had much less scope to showcase it, Borg's versatility is far better (downright mind boggling, i'd say)
In terms of greatness though, I'd pick Nadal, mostly because of Borg's early retirement vs Nadal fighting on - especially given how tough the competition was.
Nadal came back to regain the year end world #1 rankings from Roger Federer and Nova Djokovic. Borg (for whatever reason) headed for the hills as soon as he just barely slipped to #2
Borg's reputation is well deserved, but IMO, generally unfairly enhanced by his untimely retirement"