It is probably easier to adapt a pattern from DPN to Magic Loop than it is to go the other way so that DPN is just a standard. But maybe not; that's just my guess.
I learned magic loop first and after three projects I decided I would never knit in the round again. I decided to try again and I am currently working on a project using 5 DPNs; I'm tolerating it. It's not fun for me, but I am less unhappy than I had been with magic loop.
It's all personal preference. I always thought I might like the two circular needle method, but I have not tried it.