Carlesdg, while I have experience listening to many models from both Duntech and DAL, most of my opinions are based on owning a pair of Duntech Princess for 19 years.
While I admire the DAL models and agree with most of Rcprince's comments, I believe the Duntechs are a better overall product. If John Dunlavy was still with us he might disagree but I believe he made compromises to keep costs down when he returned to the US and started DAL. Two obvious examples are the drivers (no longer Dynaudio) and cabinets (simplified the step-back baffle which for my ear reduced some of the open, minimal boxlike sound). When set up correctly, both the Princess and Sovereign can sound more like a quality small monitor speaker, in terms of low colorations, than most other large speakers. Yet they can produce full range, large image, and great dynamics when called for.
Concerning amplification, during my years of ownership I tried many different SS and tube designs, including some passive bi-amping. Only three combinations were fully successful and one of those was marginal. The latter was a pair of AtmaSphere MA-1s which lacked adequate power but were magical with small group and lower sound level recordings. The best full range tube amp was a pair VTL 300s with KT-90s. The top SS was a pair of Halo JC-1s. Apparently the DALs are more efficient (regardless of ratings) and may be happier with less drive so smaller tube amps may work.
If you do a search on A'gon you should find good info from owners who have performed mods to Duntechs or DALs, including crossover parts.
Good luck.