Honestly, if you’re newer and want to find the best deck, I’d say that your approach is going to hurt you in the long run. I’d advise newer players to bring what they find interesting to tournaments and find out what works, what others are playing, and how your opponents are dismantling your strategy. Bring your favourite decks, or those made with the intention of developing fundamentals, and get crushed. And learn.
That’s assuming you haven’t been playing for months.
If this is one of your first tournaments, but you’ve been playing for a while, I’d say that you should have an idea of what works in general, and that you’d have played enough games online and watched enough videos on streams and YouTube that you can at least recognize a good number of deck archetypes and the cards that you can expect from them. At that point, you should be able to at least finish decently in even a Regional tournament, whether you made a good choice or not.
The more I’ve played the game, the less I’ve cared about the meta, to be honest. When I hear about a deck being broken, sure, I’ll target it with tech, since I don’t want to lose, but I just brought a Palana Glacier deck (with Mutate, even) to a Store Champs, with Quorum legal, and a ton of competitive players (turnout was about 21), and only barely missed the top 4 cut due to losses that were super close (by one credit and a crazy lucky Masanori draw). In general, despite the claims that “glacier is dead,” I found the meta full of amazing matchups due to the ridiculous amount of CtM tech.
So, seriously, don’t sweat the meta. It’s a nice skill, but if you just play what you think is fun, while giving yourself as few auto-losses as possible, I think you’ll have a good time at a tournament. And I don’t think that not playing “the best deck” means that you don’t have a really good shot at winning first place either.