Unless the facts about Japan are just wrong, which I don't have the expertise to judge, it seems about the same?
Bard's has a few small oddities -- the Shinkansen from Kyoto to Osaka takes less than an hour, so Day 7's underscheduled -- but those are nothing compared to ChatGPT's (days 11-13 are underscheduled; Osaka's usually bundled with Kyoto and is overscheduled anyway; dunno why a "day trip" to Mt. Fuji takes 3 days).
Additional prompting to tell it to correct the output doesn't seem to have the same effect as it does in the OpenAI models.
Arguably there's an issue in the Bard one in that it splits the Tokyo portion in two and has you return there to fly home, but also some people might prefer this to have a round-trip ticket to the same airport.
Maybe it's my lack of knowledge about Japan, but I'm just not seeing a difference between the two in terms of logical reasoning.