The different tiers are 50mb for basic and 500mb for the full.

The full one also includes:

• Stream video in 4k at 60fps

• 2 free boosts and 30% off all boosts

• Custom profile per server(different name, avatar, etc. for each of if you want)

• 200 server limit

• 4000 character message limit

• Custom entry sound(and custom sounds everywhere)

• 3x free nitro for two weeks that you can gift to people

• Tons of profile/avatar perks including animated banners, profiles, permanent quest rewards, badges, etc.

• There’s also some discount in their shop.