The least amount of noise is created by the least manouvering around the airfield so, depending on traffic and anything noise-sensitive on the ground, you could do a RIGHT base join for 27.
I have done this sometimes, having asked A/G if they minded and usually when there is no other circuit traffic.
Once, I was given this without asking at a fairly large airport with full ATC, and he put me in direct conflict with circuit traffic! I ended up orbiting over the town on right base at 800ft.