For this, I put a Nidoking with no EVs or Nature with T-Punch and T-Bolt in against a Silvally (because of even defense stats) with no EVs or Nature. Here’s how it went:
0 Atk Sheer Force Nidoking Thunder Punch vs. 0 HP / 0 Def Silvally: 75-89 (22.6 - 26.8%) -- 36.3% chance to 4HKO
Possible damage amounts: (75, 76, 77, 78, 79, 80, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89)
SpA Sheer Force Nidoking Thunderbolt vs. 0 HP / 0 SpD Silvally: 77-91 (23.2 - 27.4%) -- 69% chance to 4HKO
Possible damage amounts: (77, 78, 79, 80, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91)
As you can see, Thunderbolt is a bit higher.
Therefore, Thunderbolt, Ice Beam, and Flamethrower are stronger
Hope this helps!