Since, I haven't accidentally deleted photos or accidentally formatted
my card, but in case of doing so in the future, I would like to know
which application to choose among them to try and purchase
immediately. Because, this couldn't be done right in a panic
situation.

So, I have tried almost every retail application in the market which
claim that they recover photos from the memory cards. Most of them was
more expensive than PhotoRescue regarding the price. I even tried with
a corrupted memory card belongs to my friend. Only the application was
PhotoRescue which was able to pass the corrupted point of the card and
continue to recover all the photos. Others, crashed while trying to
pass the corrupted point.