Re: Deo-bandi, Wahabi, Ahl-e-hadith
They mainly differ in:
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Whether Hazrat Muhammad :saw: is Hazir-o-Nazir, i.e. whether he can be addressed too in the present tense and whether he can respond
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Whether Hazrat Muhammad :saw: has Ilm-e-Ghaib, the knowledge of unknown
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Whether the Last Prophet :saw: was noor or bashar
There are other differences as well, e.g. on the issue of waseela or accension of dua to Allah, visiting Mazar or Shrines etc.
Ofcourse, the basis of all these is in interpretation of Hadith traditions. I consider both of them correct, but follow the Barelvi approach.