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#3 is a considerably bigger deal than the others; it's a switching regulator and requires a number of external components, though in exchange for that, you get higher efficiency, and in that case, the ability to do both buck and boost. Oh, and it's a 20-pin TSSOP w/exposed pad or DFN, and it costs almost ten bucks a pop at digikey.
DrAzzy
I think that alternative #3 is a good choice. the input voltage range is interesting. I did not understand you warning about that Vout is 3.8V if Vin is above 3V. that is a misunderstanding. what the data sheet is talking about is that it can deliver up to 3A continuous current if Vin is at least 3V when Vout is 3.8V. if you have Vout set at 3.3V you will have 3A available even at much lower input voltage than 3V.