No doubt that with WILDs I have more vivid LDs.

DILDs are only for having first acquaintence with LD...then you should jump on different techs.

Who could do RCs for whole years?

Any DILDs I have had are mediocre as for my awareness. Rarely, it would start with high consciousness.
Also another disadvantage of DILD is that you may gain Lucidity in the end of an REM period...

However...when I made the decision to quit DILD and move on WILD...it took me a year to have my first -WILD- LD.