So, bet on higher difficulty will be better, when you lose bet ,you can get more profits from you investment in AMHash .
Thats assuming one is invested in amhash. Im not
Besides, this bet is just for fun. I may very well lose it, but its not like that would bankrupt me and I doubt roadstress sees it as a hedge for his shares.
The bet itself also has nothing directly to do with amhash. Winning it or losing it doesnt say anything about its long term profitability. For the record: I dont believe amhash will prove profitable in the long run, as its a bet on <4% growth per difficulty adjustment, but I also have no problem admitting I dont know a better offer on the (cloud mining) market right now.