Sukha in Sanskrit or Pali usually is translated as happiness, or more literally running smoothly.(As in the wheel of a chariot as an example)
Dukkha is suffering. Pretty self evident
Both equally need to be renounced it seems. Attachment to either one leads one down the wrong path.
It would also seem to me the happiness we have in this material world is fleeting at best and really ephemeral.
The suffering we experience doesn't last either for ever.
Until we realize this the wheel of samsara keeps on turning.