Including the choices due to be played at this year's European Championship, there are 10 test pieces that have been chosen as 'own choice' works on at least 10 occasions. In order, these are:

15 - Contest Music (Heaton)
14 - Harmony Music (Sparke), Music of the Spheres (Sparke)*
13 - Connotations (Gregson), Pageantry (Howells), Dances and Arias (Gregson)
12 - Blitz (Bourgeois)
11 - Revelation (Wilby)
10 - Paganini Variations (Wilby), Montage (Graham)*

* being played this year

Use the brassstats.com filter here to find other popular 'own choice' selections at the European.