is Biostar a good reason to invest on a Linux machine?

Did you mean to ask "is bioinformatics a good reason" to get a linux machine?

Yes that can be a good reason though much would depend on what kind of analysis you need to do and what budget you have. Open ended one line questions rarely have enough information to solicit a usable answer, so you should add more details to the original question.

Here are some prior threads you may find useful:

laptop or PC for the bioinformatics jobs -- specification
Lab workstation/bioinformatics PC recommendations
Should I buy a new apple M1-max with 64Gb Ram for single cell RNA seq analysis?
Macbook M1 pro/M2 pro or Dell (with Ubuntu/other linux distribution) for bioinformatics stuff?