I can't think of a single program that meets all your criteria, so I think you will have to determine what's most important to you. What I can do is furnish some details on some of the programs you're considering:

No question that Hyatt has limited coverage, particularly in Europe (but it ain't exactly great in South America, either). They are relatively good at consistency (most of the really bad FS props are gone now), and Diamond benefits generally do get extended everywhere, including on award and 3d party non-qualifying (eg Priceline) stays. Those include free breakfast (in the RC if there is one and it's open or if not, then full breakfast in the restaurant, though some may insist you are limited to the buffet), Club access if there is one and it's open, best available non-suite room (it's here that I think hotels are not uniform in their approach), and a few confirmable suite upgrades/year on paid stays. Amenity in the US at FS Hyatts is a choice of 1K points or another amenity (eg fruit plate, cheese, wine, etc.); outside the US it's up to the hotel--some of them are pretty poor, some are not. Recent announcement of guaranteed late checkout but not at resorts. Some of us have noted a less customer-oriented approach since the company's gone public; others are happy still.
Priority Club is almost the antithesis--very wide coverage, and very wide inconsistency, both in quality and in extension of benefits. I never know what I'll get unless I've stayed in the hotel previously. It's a widespread complaint among Platinums, though I've noted that Crowne Plazas generally tend to upgrade the room more frequently than HIs. The Ambassador/ Royal Ambassador program at ICs doesn't fit so well within PC, but I consider RA to be one of the best 2 top tier programs out there, suffering primarily only from the relative lack of ICs. Guaranteed 2-level UG or UG to Executive room (and often better than that), free minibar (as you know), guaranteed late checkout and (my personal favorite coming off a redeye) checkin as early as 8 am.
Hilton's lost a lot of fans with their devaluations, and I've never been much of a fan of their hotels or their service, though I can think of a couple I quite like. Their wide coverage is probably their best point. I'd also say their gold level is perhaps the bests mid-tier level of any hotel program.
SPG seems to be having consistency issues in their treatment of Plats. Their props also seem wildly inconsistent, but they have some wonderful iconic hotels in Europe, and I have friends who've been treated VERY well at them.

Hope this helps. I'd suggest you spend some time on the various forums, which should give you a better idea of what's going on.