In the RPG genre, TB (even 1st person TB Wizardry-like) was the foundation and was the predominant system for many years.
DOS2 was more popular because it is a better game overall. The "fair" comparison would be Dragon Age Series.
I wouldn’t say DA is a fair comparison. DAI is a AAA game developed by the elder god studio of the RtWP genre with a huge marketing budget. DOS2 is a AA Kickstarter developed by a relatively unknown but rising independent studio with comparatively no marketing.
