We should not conflate the reward of the Ziyaras or Hajj. Performing one does not mean we should not perform the other. Hajj has its specific times and the Ziyara of Imam Hussayn has a specific time. If you can afford to perform both, that would be great. Keep in mind, those who perform Hajj will also have the opportunity to visit RasulAllah, FatimaZahra, and the Imams in Baqee'.