Amino and Fandom are both Android apps that provide platforms for online communities, but they have key differences :

Amino:

(Note: Amino is largely defunct and no longer actively maintained, though some communities might still exist.)

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Focus:

Amino was built around smaller, more niche communities centered around specific interests, hobbies, fandoms, and even just general social interaction. Think of it as a collection of smaller, more tightly-knit forums.
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Features:

Amino offered features like chats, blogs, quizzes, polls, and the ability to create and customize your profile. It had a strong focus on visual content.
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Structure:

Communities were structured as individual spaces within the app. You[SQ]d join specific communities relevant to your interests.
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Current Status:

As mentioned, Amino is essentially shut down. While the app might still be downloadable, its functionality is extremely limited and it[SQ]s not recommended for active use.

Fandom (formerly Wikia):

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Focus:

Fandom is primarily a wiki-based platform, although it also incorporates community features. It[SQ]s heavily oriented towards fandom, hosting wikis for a vast range of fictional universes, shows, games, and other subjects.
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Features:

Fandom[SQ]s core is its wikis, allowing users to collaboratively create and edit articles about their favorite fandoms. However, it also provides forums, blogs, and other ways for community members to interact.
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Structure:

Fandom is organized around wikis dedicated to specific topics. You contribute to and interact with others within those dedicated spaces.
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Current Status:

Fandom is still actively maintained and a major platform for fan-created content.

In short:

Think of

Fandom

as a massive encyclopedia of fandoms with community features tacked on.

Amino

(while defunct) was more of a social network organized into interest-based groups, similar to a smaller, more niche version of Reddit, but with a stronger emphasis on visual content. If you[SQ]re looking for active community features now,

Fandom

is the only viable option of the two.