depends what you want to use victini for; even though blaziken has a better attack stat and speed boost, it has pretty bad coverage. Victini is used for v-create and its great coverage including fusion bolt, which hits kyogre with hard damage.pretty much outclassed by blaziken...
also, I enjoy using magnezone in ubers, which pairs well with all those dragon pokemon in the metagame. it kills skarmory w/out whirlwind, ferrothorn, and forretress w/out volt switch. It also checks cb scizor well.