Pen Pal vs Suorin Air: Pen sleek, or Wallet sleek?

Hi, I'm looking to buy a super sleek vape (no nicotine use). I do not need AMAZING gas return, and nic hit is obviously not on the table. But one thing I do want if or this to be easily portable and concealed. This is going to be more of a social thing/hobby. The Pen Pal lets me hide it as a pen while still easily vaping, and the Suorin Air could be placed in my wallet (if it's about the same size as a metro card).

So which should I buy?

Thanks in advance.