The one with pinkie pie. She knows how to get the job done and in a catchy tune too.

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Rainbow Dash.

A tie between rainbow dash and pinkie pie for me!

Rainbow Dash of course

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This is a tough one. Choosing Rainbow Dash felt like a bad choice as she's more of a sloppy finisher, which pretty much fits with her choice as that ending came out of nowhere and felt very half-baked. Choosing Pinkie would seem like a dangerous idea as it really is all about a gamble, it worked somehow, but it didn't leave much of a satisfying feeling in the end. Choosing Photo Finish would result with her taking control of the operation and making it her own, but the end result is just a faceless variation of Dash's with Photo's trademark passion.

If I must choose, Dash's seems like the best option as it was the most 'heartwarming' of the three.

Photo Finish

I feel the Rainbow Dash ending is the canon ending because it makes the most sense, and is a bit more heartwarming