It compares very favorably. Main draws are the much bigger roster (with unique move sets) and ability to switch between 3 different characters during a battle. Weird crossover story is hit or miss but I found it more interesting than the reshashed Three Kingdoms or Sengoku era storylines. DW8:XL has way better weapon customization and the neat distraction of Ambition mode, but WO3:U is as good as or better in most other ways.
That said, I think Samurai Warriors 4 is the best Musuo game on PS4. It's the most technically impressive, has a new type of attack in addition to Light and Strong called "Hyper" attacks that are tons of fun to mow down the cannon fodder soldiers with, and Chronicles Mode lets you make a custom officer which the other 2 games don't let you do.
Of course, $23.99 with GCU for Warriors Orochi 3 Ultimate is a no-brainer if you like Musou games and wanna wait for SW4 to drop in price.
If you want characters and a sense of character progression, WO3U.If you want customization and a more random experience, go with DW8E.If you want a more tech-impressive game (like framerate, amounts of enemies, etc.), go with SW4
thanks! think I'll give it a shot