Slaphead
500+ Head-Fier
It all depends on your music tastes. The Elear are fun headphones. I find them excellent for metal and hard rock, way better than the DT1990 in fact. Though, they perform poorly with classical music and jazz.
I also have the T5p 2nd and I think that they are better all-rounders and I like them more than the DT1990. However, I do enjoy more the Elear when I want to headbang for a while.
I think it also depends on how you hear, and what your tonal preference is as well. The truth is that I do use the DT1990 mainly for classical so that may well explain why I would choose the DT1990 over the Elear.