I used Anki for years, not for Geoguessr, but I've been a fan of spaced repetition for a long time.
It worked well and has a great community, but I found the process for creating cards was outside my main note taking flow, and when I became more and more integrated into Obsidian I eventually investigated how to switch. As soon as I did, I've never needed Anki, although there have been a few times I wished I could use their pre-made decks.
I know there are integrations that go both ways. I built a custom tool to take Anki decks and modify them to work with my Obsidian Spaced Repetition plugin. I don't have a need to go the other way at the moment but I've seen other tools that do that.
It worked well and has a great community, but I found the process for creating cards was outside my main note taking flow, and when I became more and more integrated into Obsidian I eventually investigated how to switch. As soon as I did, I've never needed Anki, although there have been a few times I wished I could use their pre-made decks.
I know there are integrations that go both ways. I built a custom tool to take Anki decks and modify them to work with my Obsidian Spaced Repetition plugin. I don't have a need to go the other way at the moment but I've seen other tools that do that.