As someone who plays both league and valorant, the meta definitely switches a lot more in League so you see a variety of champs being played even with the absurd amount there are. Obviously, some will be busted and be must-play but for the most part, pro matches and ranked tend to feature a lot of different champs.
In Valorant, you can play the same meta lineup for years at a somewhat effective level (look at Fnatic). When I first started playing league it was so fucking overwhelming learning all the champs and their abilities but once you get that down it actually is fun to go outside your comfort zone and play new champs even if they're not meta.