Both are RAAT – there’s little to no difference in operation (RoonReady = Roon Bridge + customization & certification for the specific device).
HifiBerry’s image is auto-updating and makes for an easy install. Mind that you cannot log in to troubleshoot if things are not working as they should.
Roon Bridge is not an image, but an installer that works on top of an already working Linux install. If needed, I made a little guide for the whole process here.
From your options, I prefer 1 – but if you’re less comfortable installing and maintaining Linux, option 2 will perform just as well.