Top:
Sabers (stupid speed. contains hand control, great tutor, individual effects are great, use cat), Infernities (OTK combo, builds advantage like crazy when you’re out of a hand, probably the best tutors in the game) Gladiator Beasts (synergetic and techy. Can play many options that can ruin the top tier decks. If the Glad deck can live past the first few turns against Infernity and Saber, they can establish a great control base to slowly take the game), Blackwings (Great advantage options, Icarus is too good, and most of all, can use Royal Oppression and Skill Drain to fuck up every other top tier deck)
High:
Frog Monarchs (Monarch every turn hurts, subsitoad and swap frog are amazing for these setups as is the new Ronintoadin. Treeborn is Treeborn), Gadget variants (Machina, Jinzo Returner OTK, and variants of. Live on card advantage, great boss monsters, run Oppression. Chimeratech Fortress and System Down make for some hard counters. ). Quickdraw variants (need to set the pace, can be a problem in this day of chainables and speed. But Dandylion can create huge advantages, and Light and Darkness Dragon plays are big. Now also have access to Junk Destroyer from the new starter).
Contenders:
Anti-Meta (Powerful lineup cards can include D. Fissure, Skill Drain, Royal Oppression, Rai-Oh, and much more), Synchro Cat/Plant variants (explosive offensives, and some techy cards, but not fast enough in the format to be top).
Untapped Potential:
Rock/Koaki Meru (powerful anti-meta type effects, strong monsters, different from the normal anti-meta builds), Fish (explosive and OTKable as holy hell. Need to get that last consistency), Perfect Herald variants (proven and can shut down every deck. But optimization has not been found yet).