Stay in Chiado or Principe Real?

Hi! I will be visiting Lisbon soon on a trip with my boyfriend, and we were looking at spots either in Chiado or Principe Real (near the botanical garden) to stay! From locals and/or people who have visited many times, would you choose one place versus the other?

I think Chiado is more central to tourist spots we will be visiting, but also more expensive. Would staying in Principe Real be out of the way/inconvenient? Any advice is appreciated! Thank you!