In this thread, I’ll post what I believe to be the best builds in the game (meta builds). Everyone is welcome to post and debate meta builds.
META = Most Effective Tactics Available (i.e. what's the best build in game to help you climb the ladder in arena and have the highest win rate). I've excluded "popular" builds that aren't really "meta." I'm defining meta as the best builds in their respective element and must at a minimum be able to achieve Rank 1 full stars (and preferably have the highest win rate possible).  The "best" builds are of my own opinion from arena testing.
Note this isn’t a build help thread. If you need build help, please go there. If you want to view older meta/top-tier builds, please go here.
I will maintain this thread for as long as I have the motivation 🙂 
Last updated: 4/15/2021
Best Build in Game:
“Best Physical”
 
PHYSICAL
Best Physical

 
HEAT
Best Heat

Boiler

 
Dual Magma

 
ENERGY
Best Energy

Dual Brightroar
Dual Bunker

Hi folks,
I'll post all my YouTube vids here. Enjoy! 🙂
CleverNameSM YT Channel
Testing a Crazy Build Series
Testing a Crazy Build Ep. 1 (Physical)
Testing a Crazy Build Ep. 2 (Energy)
Testing a Crazy Build Ep. 3 (Heat)
Testing a Crazy Build Ep. 4 (Physical)
Testing a Crazy Build Ep. 5 (Heat)
New Item Features
New Item: Overcharged Rocket Battery
New Item: Obsolete Energy Cannon
New Item: Rock Polisher
New Item: Combined Engine Unit
New Item: Basalt Polisher
New Item: Overload Preventor
New Item: Quad Core Booster
New Item: Energy Fortress
New Item: Damaged Armor Annihilator
New Item: Plasma Fortress
New Item: Overheated Heat Bomb
New Item: Platinum Fortress
New Item: Overloaded EMP
New Item: Fractured Basalt Annihilator
New Item: Broken Blizzard Annihilator
Survive or Switch Challenges
Boiler Challenge: Survive or Switch
Rank 1 Arena Fights Series
Rank 1 Arena Fights Ep. 1
Rank 1 Arena Fights Ep. 2
Rank 1 Arena Fights Ep. 3
Rank 1 Arena Fights Ep. 4
Rank 1 Arena Fights Ep. 5
Rank 1 Arena Fights Ep. 6
Arena Fight Analysis Series
Arena Fight Analysis Ep. 1
Arena Fight Analysis Ep. 2
Arena Fight Analysis Ep. 3
Rank 1 Meta Series
Rank 1 Meta: OP Physical Build
Rank 1 Meta: OP Energy Build
Rank 1 Meta: OP Heat Build
Rank 1 (New) Meta: OP Energy Build
Rank 1 (New) Meta: OP Heat Build
Strongest Scope Mech Ever?!
Rank 1 Meta: OP Physical Build
Rank 1 Meta: OP Heat Build
Rank 1 Meta: OP Energy Build
Rank 1 Meta: OP Scope Build
Rank 1 Meta: OP Tank Build
Latest Meta:
Best Builds in SM (Jan 2021)
SM and Chill Series
SM and Chill Ep. 1
SM and Chill Ep. 2
SM and Chill Ep. 3
Collabs
Challenges with Purific
Frantic Encounters Ft. Purific
Fan Made Builds Ft. Flecen
Energy vs. Heat (Collab w/ FAIOLA GAMES)
Other & Misc.
Fighting the CEO of SuperMechs (Alex)!
Beating 3v3 Campaign in Insane Mode
Biggest Inventory In Game
Massive Inventory Upgrade
Inventory Update
Climbing to #1 in 3v3 season
Can you survive Rank 1 with scope builds?
Using 6 UPCs in 3v3
4 Axes on 1 Mech
Global Chat & Fan Encounters
Hugger in the Arena
Super Close 3v3 Fight
Dominating 3v3 Arena
Winning my first solo medal
Winning another 3v3 season
Hitting 300 AP
Hitting 400 AP
Hitting 500 AP (current record)
Fighting with some Legends
Most intense cooldown fight!
Winning a lost fight, Rounded vs. Counters
Getting Revenge on Counters
Testing Crazy Builds
Testing New Energy Builds
Premium Pack Giveaway! (celebrating 1k subs)
Using Clones!
Crazy Boiler Build!
4K Health Mech
Inventory Management Guide (fooding divines)
Opening 50 Premium Packs
Opening 200 Premium Packs