Not stated on the website that this app is free, they're selling single User/PC License for 15 bucks!
i think there is no 1 Best data recovery at all (talking about common software), but you have to value every case many times TestDisk saved my life, recovering the original filesystem so I got back every file before the partition deletion; undeleting accidental deleted files; and TestDisk do this all for free in other cases I used Active File Recovery (not free) but it one of the most working software for recovering files