Weird thread subject, so I'll reply.

1 will give potentially new information, so I'd click that.

2 sounds too clickbaity, and 3 sounds like something I wouldn't care about.

For 3 to sound appealing, instead make it something like "biggest cultural differences between iceland and the rest of the world" or something to make it less about some random germanfag.

 

I would prefer almost all of those in text format rather than youtube format, so I may not be your target audience.