Really depends on your team. Giolito would make sense for someone really going for it in 2021 and 2022, with lots of players in their prime or in their 30s.
Julio is a keep for someone rebuilding or mostly trying to position for a sustained run starting in 2022 or later.
If you are somewhere in the middle then you need to look at your current long-term OF depth and SP depth right now, I guess. This would be a huge "going for it" trade. Any trade for an Ace is, even if they are only 26.