that depends on how you like to see a series.e.g.chronologically speaking one should watch new star war movies first as they are prequels & old star war movies later but any real star war movie fan will tell you to do the opposite so it depends.personally i like to see the releases in order of their release so even if there is a prequel released later i will watch it later after watching the now sequel because it aired earlier.
release order is:
bakemonogatari(2010)--nisemonogatari(march 2012)--Nekomonogatari(Kuro)(dec 2012)
chronological order is:
Nekomonogatari(Kuro)(dec 2012)--bakemonogatari(2010)--nisemonogatari(march 2012)
release order is:
bakemonogatari(2010)--nisemonogatari(march 2012)--Nekomonogatari(Kuro)(dec 2012)
chronological order is:
Nekomonogatari(Kuro)(dec 2012)--bakemonogatari(2010)--nisemonogatari(march 2012)