What cache should be cleared for front end theming work?
Here's the comprehensive list of cache-clear options and the underlying API functions &amp; what they do:


drush cc drush - drush_cache_clear_drush(): Drush's internal cache for data from the Drupal install (e.g. available module commands).
drush cc all - drupal_flush_all_caches(): All Drupal caches.
drush cc theme-registry - drupal_theme_rebuild(): All theme metadata.
drush cc menu - menu_rebuild(): All menu metadata.
drush cc css-js - drupal_clear_css_cache() drupal_clear_js_cache(): Aggreggated/Minified CSS/JS files.
drush cc block - cache_clear_all(NULL, 'cache_block'): All block metadata.
drush cc module-list - system_rebuild_module_data(): All available modules (reloaded from file system).
drush cc theme-list - system_rebuild_theme_data(): All available themes (reloaded from file system).


That should let you fine target the cache to clear when it's needed. 

Depending on your workflow, you might also want to force the cache off (e.g. $conf['preprocess_css'] = 0; &amp; $conf['preprocess_js'] = 0;) in local.settings.php for your local dev environment so it doesn't interfere with feedback.