If you enjoy the nightlight, Patong is certainly the place to be. Or even worth a trip for a night or two to check it out regardless of where you are staying in the area. It is usually very crowded here. The shopping here is pretty good. There are some nice hotels on the beach front with swimming pools.
When we were there we rented motor bikes which was a good way to get around.
I remember Kara beach as being much more quiet.
Perhaps someone who has spent more time in this area can chime in….
Regards,
Dave