The x64 means 64 bit (which pretty much all PCs and Macs are today).
The .zip, and .7z are archive types;
A computer archive is when files are all stored into 1 (or sometimes more, but 1 in this case) file that needs to be extracted before you can run (or use) it.
The .dmg is a file that is mountable (like a CD or DVD) made specifically for/from Apple as installation software.
So, I believe the .dmg would be a native file, and the other 2 would be able to be un-archived to run and install FreeTube as long as you have the proper software to use them.
I’ve never used MacOs, so I have never used any of them on a Mac.
Since /dmg is native to MacOs, I would think it would be the best bet to use, and it should be recognized.
I thank you very kindly for your clear explanation, Bikkuri, and look forward to trying it out this weekend!