@ef9 o shea
*cough cough*
They are not both teleports. Teleportation is theoretical transfer of matter or energy from one point to another without traversing the physical space between them.
The more I look at Dante doing Trickster, less I believe he teleports and instead simply moves faster than the eye can register. Spikes not hurting him is cause of invincibility frames, something that is available only when doing single dash, not double or triple. If he were teleporting, then all these dashes would have the same invincibility effect.
Disappearing and appearing above enemy with weapon ready to strike is an old trick I've seen in cartoons, manga and anime, and it always meant speed, not fooling around with physics.
One could say Vergil does the same, but with Yamato giving him abilities that defy laws of physics (cutting through dimensional barriers and such), it is kinda believable for him to be able to teleport.