However, this leads to the same reason Stealth Rock never got tested in 4th gen, despite their being some clamor for such a test (and despite myself having been a supporter of such a test, I did have to agree with this reasoning): how do you define "better"? Just like in a Stealth Rock test, where the Standard ladder would maintain it but a Suspect ladder would be set-up without it, the meta-games would just be different from each other--different Pokemon and strategies would be prevalent, some Pokemon might be broken that wouldn't be otherwise and some broken Pokemon may no longer be so. The result though will be that the metagames would just be different from each other--neither one would be inherently better than the other and which one to go with would just depend on stuff such as each individual's philosophy on what the ideal metagame should be like, which doesn't have much to do with testing.
Since such would be the case, it would be pointless to test them, as unlike with whether or not Pokemon are broken, where there's typically a clear answer, no such answer could be arrived at through testing this, as you won't get an answer of whether or not it's broken (as it's just a game mechanic)--the resulting metagames would just be different from each other. That being so, a test of this is needless, and as it would come down to a question of preference regardless, it's just something that we need to skip right to making a decision on whether or not the modes that have this should be simulated, and go from there, really.