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On paper. In actual practice, over more than 3-5 shots, and assuming RAW (or at least HQ JPEG), the experiments I've seen tend to favor the canon.Your T3I shoots at roughly 3.7 FPS, the D5200 does 5 FPS - so it's faster than your T3I but not as fast as the A77 which I think does a 12 FPS burst. I do recommend a fast memory card - I use a 95 mps Sandisk Extreme pro with my 5200 and it does an excellent job, it's fast enough for what I need.
Looking at the D7100 vs 70D, the D7100 doesn't manage a full second of continuous shooting in raw before the buffer fills; while the 70D managed several seconds. On JPEG, the 70D could shoot indefinately while the D7100 only managed a few seconds before buffer fill (and something like 1/sec after that).
I am guessing to extrapolate to the D5200 and T3i; but I don't think it's unreasonable to not trust stated shooting speeds.
Depends a lot on factors such as the speed of the memory card and camera settings, also how long of a burst your firing and whether your using RAW or JPG. Canon's generally have a larger buffer and when compared to as similarly priced nikon they often have smaller image sizes because their sensor offers fewer MP, so with the same write speed memory card you have to give them an advantage for longer bursts when shooting RAW, but of course a lot depends on just how long of a burst you want to shoot. In JPG mode it generally doesn't make a difference, both will shoot extremely long bursts of JPG without overloading the buffer unless you are using a slow memory card and even then they tend to recover pretty quickly.
So really it sort of depends on what your after, if the better image quality is the most important goal I recommend Nikon, If shooting speed is your primary concern Canon or perhaps even Pentax/Sony depending on what other features rate highly on your list. But when you look at the OP's listed budget the 70d is going to eat up most if not all of it just for the body which is why I scratched it of my "recommend" list. Anything less than the 70d wouldn't really be an improvement over the T3I in image quality, pretty much the same sensor all the way around - so really not going to accomplish the OP's goal.
I really do try to recommend stuff based on the best features to meet a person's needs rather than on brand name.