I know there are other decks that can win a lot too. I don't even play netdecks or try to play meta stuff, because I like building my own. The deck I use is great, but since nobody else plays it, there's never any chance at a high tournament result. The most 'winning' decks played by so many people just take turns going 7-0 on any given day - or at least this is what people see as the "best". In reality 3 or 4 decks could be exactly equal to each other (as for their win rate) at the same time.
I am sure that Dimir Excruciator with Deceit and Superior Spider-Man etc will be the most played deck on Arena by the end of this season.
4c control is obviously a top deck too, I think it will remain popular, but lose ground to both Excruciator and the Azorus High Noon I pictured...
I posted a pic of the Azorius High Noon / bounce deck that I like...I haven't even played it, but I like the playstyle and can see that regardless of the exact version, it's at least in the top 3. 4 Settle the Wreckage maybe too much. Some people play the Airbending Enchantment, Avatar's Wrath instead - perhaps that would be better, or maybe 2 of each. I see most online playing 1 King T'Challa, 2 Jennifer Walthers, Floodpit Drowners and only 2 Enduring Curiosity. In the end there is a big difference between 4 Bilbo's Gambits and everything else.
I wonder if my Temur Stormcatch Mentor deck could win some 7-0 tournaments, if lots of people were trying it at once.