Nano is faster!
Bitcoin is slower.

Nano has no fees, you send 1 Nano you get 1 Nano!
Bitcoin has massive fees, you send 0.01 Bitcoin you get 0.0097 Bitcoin.

Nano has superior tech!
Bitcoin is outdated.

Nano is the future!
Bitcoin is the past.

Why aren't you holding any nano?
Because, every altcoin has newer technology, but these technologies are not tested enough. They're not safe enough. So there are more problems that possible profit.