None have both TCR and resistivity listed in the product information, so it's impossible to tell how good they will be (and impossible to set up your mod to run them properly). Absolutely useless product listings.
It's all a bit confusing, because the XX in NiFeXX usually refers to the Fe content, but it seems Crazy Wire are breaking the convention - those crazy bastards.
Stealthvape NiFe30: 30% Fe
Dicodes NiFe30 (resistherm): 30% Fe
Zivipf NiFe30: 30% Fe
Zivipf NiFe48: 48% Fe
Nifethal52: 52% Ni (i.e. 48% Fe)
Crazy Wire NiFe52: 52% Ni (i.e. 48% Fe) listed on website product description
Crazy Wire NiFe48: Not specified
Crazy Wire NiFe70: Not specified, presumably it's what everyone else calls NiFe30 (70% Ni)
Even though it looks like, based on composition, that Crazy Wire NiFe52 is the same as Nifethal52 (or Zivipf NiFe48), you can't assume the properties will be the same. Dicodes and Stealthvape NiFe30 are totally different, for example - the differences are presumably a result of different manufacturing processes or other trace metals in the alloy. Zivipf NiFe48 is advertised with the same resistivity and TCR as Nifethal52.