nikon or cannon

[EJRPhotos]

I have been really debating between the canon eos 5d mk3 and maybe the Nikon d600 I have a nikon D50 and it just is not producing good photos (I have tested the same shots with other cameras and it is the camera not just me) I have 2 af lenses and about 10 old analog lenses between what I got from my grandfather and as a gift from an old neighbor. So it is really down to what camera kit I want to get. Can I maybe get some help with my decision? I will write out all the lenses I have later.