The poll question ("truly believe should") and the OP's opening post ("where do [you] WANT") are just not the same thing.
I answered the poll on "believe should" as Buffalo, but I WANT him to start the AHL.
I "truly believe [Reinhart] should" start in Buffalo from the perspective that 1] he's earned the shot with his own work and 2] I don't subscribe to the notion that the team as a whole is better off finding roster spots for McGinn, Des or Legwand.
I envision a world in which someone like Legwand is entirely expendable (got other vet leaders, thanks), Des ain't desperately needed (given the team as a whole tough play and all the physical players upfront mingled thru the lines), and either one of McGinn/Foligno replace the other (me, I'd keep Foligno as the younger, with better numbers, better health history, and team draft). But then I also envision a world in which the 3rd and 4th lines could be interchangeable, running 8-12 mins a piece, depending on the player and special teams. So, even Reinhart transitioning to the NHL on the 4th line would give him far more real-world growth opportunity than an AHL year with prime ice-time.
But I "WANT" the kid to start in the AHL because this year seems primed to be all about Eichel first, O'Reilly and Kane second, then where the Ennis, Moulsons, etc. fit in going forward third. Reinhart is a second (or fourth) thought nowadays, but I think in the long run offers the club just as much longevity as Eichel, and possibly even more upside down the middle than O'Reilly. The long term could, and I believe will be, should things unfold without trades, a 1-2 punch of Eichel-Reinhart, with everyone else finding a spot or not.
But for now, while it's all ra-ra Eichel, Kane, O'Reilly, etc., let Reinhart live his own life, his own record, his own stats, his own ups/downs away from the spot light - and enter the NHL after the trade deadline or, better, next year altogether, as a savior in his own right. After Eichel, et. al. have had theirs, and when the media and fans need fresh blood to cheer on.
"should" and "want" are to very different things.