First, important point: every Postgres DB is in a cluster.

Second, important point: yes, you should use Debian because Debian has consistently provided the upgrade-in-place experience that PG has lacked until.... just now, actually.

Third point that you didn't ask about: you should learn a little about PG tuning, because on day 1, the config is tuned appropriately for your Sun Ultra 5 workstation.

https://en.wikipedia.org/wiki/Ultra_5/10

(I am slightly exaggerating, but you should investigate anyway.)