Hiya!
I lived in Talybont North in first year and I had friends living in Talybont Court. I think Taly South is the best for parties, but it does get really insane (I can hear the music from Taly North sometimes!). North is a bit more calmer than south - though we still have our parties haha. Though, you are right, it is quite small. Its alright if you're not looking for anything too luxurious - and the best part is that its the closest to the sports facilities, which helps if you find yourself as quite a sporty person.
Taly Court is a bit nicer just because the kitchen is bigger and so are the rooms. Plus, its closer to campus. They're all in the same area, but I found myself having to do a longer walk from North than my peers in Court just because the Talybont living area is actually quite big! I would say that Taly Court is still good for socialising.
On the other hand, Talybont North is closer than the others to the shops (Tesco and Aldi). So, it really depends on your preferences!
I hope that helped!
- Fatiha, Cardiff Uni Student Rep