I personally prefer cs circuit, because there are more international matchs to watch, and every person has a chance to take part in the major, with no need to join a big org.
CS, but sometimes it can be bit hard to follow. When I started watching CSGO esport for first time I had no idea when top teams would be playing so I just watched some random tier 2 tournaments before learning more. OWL was first esport I started following closely and it was made easy by the franchising system. So overall CS style is better for more games and better for balance, but Valorant style will be easier to follow and franchise systems can be fun if done right.