If you don't care if your music computer uses Windows or Mac, then I'd suggest Windows for multiple reasons:

1. Band-in-a-Box for Windows includes RealBand.
2. Band-in-a-Box for Windows has more features than the Mac version.
3. The Band-in-a-Box for Windows forum section has more users than the Band-in-a-Box for Mac forum section. More users equals more people to answer questions.

RealBand can use Band-in-a-Box song files, RealTracks and UserTracks. That means all the files that can be used in Band-in-a-Box also work inside RealBand.

The strengths of RealBand and Band-in-a-Box for Windows compliment each other. Band-in-a-Box is strong in setting song structure and views songs in three parts, Intro, Chorus and Ending. RealBand looks at songs in a linear, time based line from beginning to end.
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Jim Fogle - 2021 BiaB (842) RB (Build 8) Ultra+ PAK
Cakewalk - Zoom MRS-8 recorder
Desktop: i7 Win 10 build 2004, 12GB ram 256GB SSD, 4 TB HDD
Laptop: i3 64bit Win 10 build 21H1, 8GB ram 500GB HDD
Music at: http://fogle622.wix.com/fogle622-audio-home