If anybody gives you a 'definitive' answer, they could be doing you a disservice.
Is it practical for you to visit a photography/CE/department store in your country to handle and test out these cameras? Those three bodies are very similar in terms of what they can do but you may find that you prefer the ergonomics and/or the menu of one over the others - that was the case for me deciding between the Canon EOS 550D and the Nikon D5000 a few years ago.
The 55-250mm bundle for Canon sounds tempting but do you think that from the beginning, you'll be shooting subjects from such a distance, you'd need that focal length to fill enough of the frame?
DSLRs: Canon EOS 7D Mark II, Canon EOS 70D
CSC: Canon EOS M3
Lenses: Canon EF-S 15-85mm f/3.5-5.6 IS USM, EF 50mm f/1.8 II, EF 100-400mm f/4.5-5.6L IS USM, Canon EF-M 18-55mm f/3.5-5.6 IS STM, Canon EF-M 22mm f/2.0 STM