Well actually like the 1 on 1's the best..but if I had to choose it would be SOS Battles..even though I think both could end up getting pretty tedious..but you can stop SOS Battles with a status problem for the most part..and all I can think of the horde battles against Magnemite all those Supersonics (one's bound to hit out of five..) also one I'll never forget is Arbok (it was extremely hard to find as is) but battling five was something else-first Glare then multiple Screeches..and wrap as well..same thing with Bellsprout except it had the powders even though it was like five wraps constantly I never thought it would be what it was mine was past half in HP and it took forever too..or at least it felt that way..:> So I guess I prefer SOS Battles of the two.