Xbox PC Aiuto Su Quale Tsw Installare

Good morning, I kindly wanted to know, I have tsw3 in steam, should I buy tsw4 or do I stay with tsw3? the steam library says that I already have train sim world, thanks

 

For my experience, TSW4 is the best

 

Put it this way:

If you stay with TSW3, then you're eventually going to be stuck and won't be able to purchase new content.