Ok, so I've been trying a couple of teams that can work well on both ladders, and I thought I'd post my experiences here.
1.) Specs Kingdra + OTR Bronzong is a lethal combination for opposing teams. The common factor between the two teams that I've been using is this combination, and they go together like soap and water.
Modest Specs Kingdra hits 317 Special Attack, which is just 2 less than Timid Specs Latias. However, I personally find it easier to switch in, provided you use the spread 100 HP/252 SpA/156 Spe. This gives Kingdra lots of bulk for a choice user, and Kingdra's 4x resists (Fire/Water) are held on VERY common pokemon such as Heatran, Suicune, Vaporeon, and many more. In addition, Kingdra doesn't need to come in multiple times in the match to do its job, and with just 1 weakness (Dragon), not much is going to be KOing him in one shot; in fact, it takes a lot of power to outright 2HKO him.
Kingdra really destroys the Steels that try to switch into its Draco Meteor, even moreso than Latias did with her Specs set. The Water STAB, and even Hydro Pump is a big contributing factor. Empoleon is pretty much the only Steel that can't avoid a 2HKO, and even he still takes a lot. You won't believe how many Skarmories have come in suspecting a DD set just to get an epic facial so nasty that he can't help but faint.
For those of you complaining about Stall in the Suspect metagame, you really shouldn't be complaining if you haven't tried Specs Kingdra. Blissey is literally the only thing that can take a big hit from Blissey, though she still loses a nice chunk from Draco Meteor. Specs Kingdra goes so well with OTR Bronzong because he Kingdra takes out Rotom-A, Forretress, Suicune, Swampert, and basically any of the bulky Waters that would give Bronzong any trouble. Even a full health Blissey WILL be OHKOed by Draco Meteor if Kingdra gets a Sniper CH (low chance, but still possible).
OTR Bronzong (Offensive Trick Room for those who don't know of the set), on the other hand, not only wrecks offensive teams, but is just generally great at cleaning up the mess. As one of the bulkiest and "fastest" sweepers in the game, this thing is quite a threat to any team, provided bulky Waters, Skarmory, Rotom-A, and other Bronzong are gone. If you read what I said about Specs Kingdra though, you'd know that he rips all of those things apart.
The great thing about OTR Bronzong is that he's not only really easy to set up with his great defenses and single weakness, but it's that by just slapping a Macho Brace (no Life Orb recoil xD) on it, you're packing a 150 BP STAB move on anything with 185 Speed or higher (base 75s with no investment), which spells pretty much all of OU. And it has 100% accuracy on top of that! This means that you can pull off a lot of "guaranteed" sweeps at the end of the game, especially with Explosion in hand as well.
Against Stall teams, it still contributes quite a bit, because although it doesn't do it to the extent of Specs Kingdra, it still tears through certain members. For instance, Gliscor and Blissey are easily 2HKOed after Stealth Rock by Gyro Ball, and Tyranitar is OHKOed. Don't forget that he also has Explosion, which can easily take out a vital member of your opponent's team. On a stall team, losing even one member can mean losing a lot of the synergy in your defensive core, leaving them open to a lot more threats.
OTR Bronzong can also support Kingdra with his Trick Room, though he often uses it for himself. It's not advised to make Kingdra have low Speed and all that stuff that you might do when you think of Trick Room. Just keep in mind that you should only do this when the opposing team is stuff that Bronzong can't beat, but Kingdra can. That goes for any kind of Trick Room thing, but I thought I'd just point that out.
2.) Offensive Spike-stacking is really bad for offensive and stall teams alike. On my offensive hazards team, which has gotten extremely high on the suspect leaderboard through an alt, I use Froslass and Heatran as my hazard stackers, and then I watch the fun unfold.
Froslass is a very good lead Spiker (I've tried it as a non-lead, and I can't use it that way for the life of me), setting up at least 2 layers against a large amount of leads. Heatran is a good Stealth Rocker because his typing complements Froslass's perfectly.
Once the entry hazards are set up, Stall isn't going to be switching around nearly as much. Blissey is destroyed by my Heatran since it's a Modest Taunt/LO variant with Fire Blast and Earth Power as its attacks. Specs Kingdra is also on this team, and if you thought things couldn't switch into it before, it's somehow become even harder now. Some Salamence try to switch into Heatran's Fire Blast, only to realize that if Fire Blast actually hits them, they've only got something like 25% of their health left thanks to the SR damage.
Even Offensive Rotom-A is really good on one of these kinds of teams, because a lot of the stuff that likes to switch into it is grounded or weak to SR. This means that they're going to have a lot of trouble taking those STABs. For example, Heatran, who seems to love switching into Rotom-A to try and take a Will-O-Wisp, is dead after 2 Thunderbolts.
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To be honest, I'm not really sure which ladder I prefer. However, I do like that the suspect ladder has basically no Skarmories, because I absolutely hate that pokemon and think it should go mysteriously extinct when B/W comes out. :]