[Jorgen]

I'm pro-SToss in this argument. The main thing about Reflect is that the only things you can set it up against are only forced out by SToss, and the only things it helps against only need to come in against Zam to beat it if it's running SToss to preserve its Psychic PP. Psychic and Twave threats are usually enough to make Physicals keep their distance most of the time, and who knows, with prediction you probably end up killing them with Psychics when they switch in predicting Recovers instead of just having your Psychics wasted against stupid Starmie.

EDIT: All this time we're assuming Zam needs to use either SToss OR Reflect. What about a SToss PLUS Reflect set at the cost of Twave? Granted, Zam's general use is as something that easily shuffles things and paralyzes them, but if you have Reflect and two attacking moves to preserve Psychics, you can get something like Stun Spore Eggy to paralyze the Starmies/Alakazams that need to be para'd in order to die to SToss. Of course, Chansey is a problem, but it can be forced out to make something take a Psychic that hates it, and of course the aforementioned Eggy can just Explode on it.