Lots of tough questions, and you'll probably get all kinds of opinions on them.

midi or Real Tracks - I'd suggest to use both - whichever fits your particular need better (you can edit midi tracks)

Real Band or Logic - depends whether you want to work in Windoze or Mac - BIAB for Mac does not include Real Band, but if you've got Logic you wouldn't need it

midi stuff out of PC sounds like toys - that's a function of whatever midi synthesizer you use - Logic has some good quality midi synths available - probably way better than your default Windoze synth - take some midi creations into Logic, see what you think about the sound

Bruce

Macbook Pro 2018
2.6 GHz 6-core Intel Core i7, 16 GB RAM
OS Monterey
BIAB for Mac 2022