I have Hyrule Warriors and my only experience of another warriors game has been to goes on DW8. First: just before I played Hyrule Warriors, and second: shortly after I'd finished the story mode of HW.
At least the early parts of DW8 don't feel as fun as Hyrule Warriors. You run slowly and have to call a horse if you want to travel distances at any acceptable speed and the overall game feels more sluggish by design. I don't know if you get to upgrade your speed or if the game gets better. I am aware that DW8 has many more playable characters.
I would like to hear what DW fans think of HW. Are the higher scores for HW justified?
I found my overall experience was much more satisfactory with Hyrule Warriors. Certainly I can say, as someone new to the series, HW begins in a much more enjoyable and accessible way.