I've been using Drush on Drupal 7 for a long time, but having started on Drupal 11 I've gotten more used to the Composer approach and see on Drupal.org that many Drupal 7 modules can be installed through composer.

Are there any gotchas installing Drupal 7 and installing/upgrading modules with composer?

Is Composer usage on Drupal 7 mature and comparable or even better than Drush?