I have to say technology wise, the major camera manufacturers are all at par. Some models will exhibit certain slight weakness or strengths, but all in all, most of the users will seldom (or never) notice the difference. Whether your pictures will come out good (more than performance) will depend on your composition, understanding of the particular camera and your technique.
That said, what you need to look at is:
1. Whether the feature set of the specific camera meets your needs.
2. Which user interface you like more.
3. What is your roadmap? If you are planning to get only a few of simple lenses for the next 2 years, Going with any system will pretty much be the same. All brands offer the standard lenses like: standard zoom (like 18-55), telezoom (55-200), 50mm prime, Ultrawide. There are also many very capable and popular 3rd party lenses (Tokina, Tamron, Sigma) available for most mounts.
4. Whether you like the feel of the camera.
And nothing beats going into a store and have a feel of the cameras. You are not going to get too far asking in the forum.