That's a question that depends on too many subjective variables to properly answer. Factors such as the purity of your extracted DMT, the way you heat it up, the way you inhale, your own mindset, set & setting, your current physical condition, etc, etc, etc. Every ROA can induce an incredibly potent effect if executed properly. Yes, the different ROAs assume different amount of product will be ingested to achieve the same result, but that's beyond the point.
Why are you seeking the ROA that will induce the strongest high from DMT?