Commander One gets somewhat good reviews over on macupdate - I use this too from time to time when I feel for something else to look at - It has a few customize options, such as setting a Norton Commander style apperance for its listers. For whatever reason I do this. I have no connection to Norton Commander as I was using Directory Opus and DirWork on my computers. If you like to style your listers then Commander One could be one for you.
I was going to suggest the free(in beta)Marta File Manager but I don't think it has any FTP capabilities.
Version 2.0 of Commander One is spoken of as being in development but Eltima Software writes in January to a commenter on MacUpdate that there are no exact release date for version 2.0 of Commander One. But if you can wait a while, I suggest looking out for that one. The current Commander One file manager doesn't have many troubles doing things - mostly the reviews are about the cluttered interface with no sidebar as ForkLift has. It's not like the options for file managers on the Mac is currently lacking. And a few also connects to FTP servers and whatnot. I mention this because of the earlier purchase of Transmit.
Edit: Also, Double Commander is a suggestion too(though the app is clearly not macOS in its apperance - it does open and operates)
https://sourceforge.net/projects/doublecmd/
Though the entry by me might appear as a rant - it's just information from the top of my head.
