SWIM had some a while back that did have DMT in it, a lot actually. Before that, he didn't believe any Yopo had DMT. But some Yopo definitely has enough that you can feel it.
Yopo is specifically peregrina, Vilca is specifically colubrina.
Vilca is better. Even the Yopo that SWIM had that was very high in DMT, was inferior to Vilca. DMT is weak compared to bufotenine. Bufotenine is about 5-10 times stronger than DMT. Plus Yopo is more toxic than Vilca.
If you want DMT, you’re better off getting mimosa. Although some Yopo has more DMT than Vilca, it also tends to have much more toxins than Vilca does.
That’s been SWIM’s experience anyway.
In Anadenanthera By Constantino Manuel Torres, David B. Repke, page 116, they talk about a batch of peregrina that was found to contain only DMT and 5-MeO-DMT. The alkaloid mix was 96% 5-MeO-DMT, 4% DMT, and no bufotenine. They were tested using gas chromatography.
So yes, there are some out there that don’t have bufotenine in them. But they are rare. Some peregrina are high in 5-MeO-DMT, some are high in DMT, but most are high in bufotenine and some toxins. With Vilca, it’s pretty consistently just bufotenine and some other toxins. With peregrina, it's a gamble (usually less toxins than Yopo). It could be high in bufotenine, high in DMT, or high in 5-MeO-DMT, or just high in toxins, or all of them! But in general, Yopo is much weaker and more toxic than Vilca (usually 2-10 times stronger than Yopo).
With Yopo, at most you'll get about 0.16% DMT. With Vilca you can have up to 12.4% bufotenine.