@Jerry1972, try everything you can!
1.) If you have stopped the ransomware in its initial phases and you have Shadow Explorer turned on - you might have Shadow Volume copies that will still be there and work.
N.B.! A side effect I can think of is if you already removed the malware from your PC and you select a date when the ransomware was already on your PC. That way, you can get the ransomware back and it might encrypt more stuff.
2.) The Kaspersky decryptors look for a decryption key and files currently on your PC. No side effect - you either find a password and decrypt your files, or the decryptor gives you a message that no password is found.
3.) Data Recovery Software tries to recover specific deleted files, unlike Shadow Exlorer returning files as a whole. I hope you haven't formatted any disk drives after the infection - not only that won't remove the malware completely, but it will prevent Recovery software to work, as the information from deleted files will be overwritten.
No side effects - you see if you restored any files - you choose what to restore - pictures, documents and precisely which files - if you see something named .cerber - don't restore it.
Conclusion: The 3 methods are different and it wouldn't hurt to try them all. It doesn't matter if you do them all or not. Doesn't matter in what order you do them. Just try doing only one method at a time. Because, the decryptors, for example, would need as much as computer resources as they can get.