(Presuming it's a Conquest format, 4 decks, 1 ban)
ST Dwarves is clearly the most dominant deck, with no clear counters outside of Mill and Consume Monsters.
So I would expect everyone to bring an ST deck, with an expectation that it may well be banned. It might also divert a ban away from another archetype you want to focus your lineup around.
There are a couple of target strategies you might want to use, which could influence your ban choice away from ST.
The major deck of interest here is Nekker Consume. It's a pretty binary deck, in the sense that it beats EVERYTHING in the format (including Dwarves) unless people directly tech against it (i.e running Sweers in NG and / lock effect in other decks). Then it loses horribly, there's no in between.
So you can construct a lineup that targets Nekker Consume and looks to make it go 0-3. However, if you do so, you run the risk of weakening your matchups across the rest of the field. There's also the possibility that you could flame out if your opponent isn't running consume at all
If you are looking to run Nekker consume in your own lineup, then you will probably need to ban NG over ST (to avoid Sweers cheese), and resign yourself to being unfavoured in the ST matchup.
The other out of left field strategy would be to do something like fill your lineup with weather effects if you are expecting very little weather clear.
The matchup dynamic is very binary here - if you have weather and can force a long round without your opponent having a clear, you win. If they have a clear, you are unfavoured. So it's probably a good idea for most of the decks you choose to take to have a weather clearer (which usually have utility in other matchups anyway).
In any case, I would expect:
1) Everyone to bring an ST deck. If they're not planning to ban ST, they can tech their ST deck for the mirror, possibly running Eithne + Horn over Brouver.
2) Everyone will bring a NG deck. All those NG decks will run Sweers to target Nekkers and a lesser extent Dwarves, if they're left up. There will be a mix of NG Spy and Alchemy. Spies overall power level is probably higher than alchemy, but is much more vulnerable to lock strategies that people might try. Alchemy has little polarising weakness, outside of weather and getting outpointed by OP decks. Full on Mill NG might also be a thing, since you can target Dwarves and Nekkers. If lists are open and everyone knows you're running Mill - this will be a high priority ban (leaving your ST open). So it's a viable, if risky, choice.
3) I wouldn't bring Nekker consume at all, given it's vulnerability to counter strategies. However, it is a high power level deck, so people might just ban NG and roll with it.
4) Nova Bears is a solid deck that will usually get a win somewhere, particularly if ST is banned.
5) Radovid Armor is a niche pick I would probably go for too - solid with lock effects vs Spies / Nekkers, solid against weather if people go that route. Just vulnerable to being outpointed by better decks - but if you ban ST you're in good shape.