Also take a look at: https://electricpeople.org/post/which-electric-unicycle-is-best-for-me-5e8cb38260242b53ae7229fb

Speedy Feet
Speedy Feet
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I recommend the Ninebot Z10 because it can handle your weight and is easy to learn on. The great thing about learning on the Z10 is that it will remain fun to ride as you become more skilled because it is so unique.
Begode RS ... HT for a beginner. You could also try a monster pro cause your weight will ease handling of that. Downside is it will be more an effort to learn on.