I recently recorded audio from cassette to my pc by using a cable with
a 3.5mm cable on both ends (I think they're called mini-jack plugs(?)
from the headphone socket of my hi-fi to the line-in socket on my pc.
I found the results to be quite acceptable.

I've now found another cable with 2 (i think they're called) RCA
connectors which plug into the back of the hi-fi in the line out
sockets.

My question is: are RCA cables considered to be better than the
mini-jack cables I used?

Many TIA.