I'd go with either a Spade, Rocna, or Manson Supreme for your primary anchor, and size it such that it can hold you in even the worst condtions with little trouble. They're all fairly comparable in terms of construction and holding power.
The hydro bubble strikes me as a bit gimmicky, and the "bubble" part will lead to the anchor being less dense, and likely to not set as well IMHO. Also, how damage resistant is the bubble. My guess is that it isn't all that durable...and if the design of the anchor is such that the bubble is a critical element, damaging it is a problem...and if the anchor doesn't require it...the metal the mount for the bubble takes up could be better used elsewhere.
A Danforth of some sort is a good kedge or secondary anchor, provided it is heavy enough. I prefer the non-high tensile strength versions of the Danforths.
I'd avoid any stainless steel anchors, as they are not really suitable on a cruising boat, especially if you're going to be spending any significant amount of time on the hook. Stainless steel buried in mud is likely to corrode rather quickly, especially in the tropics. Aluminum anchors are also problematic and subject to corrosion as well. Galvanized steel is still the best material for an anchor or ground tackle gear.
Having a hydrobubble as a primary and a spade as a secondary strikes me as a bit less than useful, given that they're both rather difficult to stow and unless your boat is equipped with a dual bow roller setup, it would make more sense to have a secondary that stores compactly, like a Danforth.
BTW, just for full disclosure, the primary on my boat is a Rocna.
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