I'm not sure if you know how small and well regarded the Alfa is. The GH, when it's widely available, will usurp it as the stealth king, but the Alfa is actually smaller than the Pax 2.
I can see what you are saying and am somewhat aware of the alpha's ability.
The Pax 2, in my opinion, is much more stealthy than the alpha. It is slimmer and looks less suspicious. Perhaps I just enjoy the form-factor better (e.g. Slimmer and longer).
With its flush mouthpiece and no button design, it could easily be passed off as a mini powerbank (looks like one my girlfriend has), or possibly as an old school mp3 player.
I would much rather have to explain a Pax2, to a figure of authority, rather than an Alpha.
I have an Indica, however I have never liked the performance. I gave up on it some time ago and am looking for a stealthy unit to fill the void.
Grasshopper or pax2 are my best bets now and perhaps the vapir prima.