Which is better?
Both get the job done.
Very few people own both, so the answer you will get will be personal preference.
For a comparison of specifications, go here:
http://snapsort.com/compare/Canon-T3-vs-Pentax_K-r
..
Need some advise from the pros outthere.Im thinking about buying my first dslr camera.Im looking at two of the basics dslr in my price range, canon t3 and pentax kr. Picture quality is important,good performance in low light, good for sports details on fast moving objects (fps),etc. Overall, whichone is the better camera?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic