RH1 is definitely the preferred method. You can get the original unconverted floating point ATRAC file that way and even play it in VLC, or choose from a number of conversion options with ffmpeg. Pretty sure sonicstage is no longer working on Windows 10, but there's a group of coders that put something together called QHImdTransfer, I believe it runs across windows, mac, and linux systems, and the latest version will copy old ATRAC files using the RH1. Using the digital out method is very time consuming and you are locking yourself to a fixed bit format rather than having the original file that can convert to any format of choosing at a later time (some of the machines with digital outs let you choose 16, 20, or 24 bit output, so there is data there beyond 16 bit fixed PCM, which is what sonicstage converts to, and what you get from a digi out).
If it's only a few discs I can do them for you no problem, if it's more than a few, let's talk.