hordes are way better then super training
In super training you get a maximum of 24 evs(defeat super training boss lvl 3 and large bag)
In hordes you get a maximum of 50 evs if each of them give +1 for each and not +2 like the floatzel horde.(horde,enchance item and pokerus)
The only way super training can be useful is to get items, train a LC team or that you just dont want to level up your team yet.
Hope I helped! :D