China DOS Union

Which is a bit better, DR-dos 6.0 or MS-dos 7.10? I mean which one would be better for me to install, or which one do most people use? I only have a book on DR-dos 6.0, so if I self-study I can only rely on that. Also, if I install a dual operating system, I mean XP and DR-dos, will there be anything unsuitable about it? I mean, can the two of them coexist peacefully? That is, for one folder or one application, can I use it both under the XP environment and under DR-dos? For example, a music player: TTPlayer and so on. Also, if I boot into XP, then of course it can do multitasking; if I restart and switch to DR-dos, can it still do multitasking?