Bozja content is better than Deep Dungeons because:

1) Like DD, you are sync'd up to level 80, but you are given more than just trash mobs and nominal bosses to kill to test out your kit.
2) You can progress a relic weapon (which is a shiny just like Deep Dungeon glow weapons)
3) You can gain rare minions and mounts just like DD
4) You get an actual interesting storyline
5) Progress at your own pace without having to queue every 10 floors
6) Actual progression system with Lost Actions, which make the combat more interesting than just 100 floors of the same trash.
7) Bozja forces you to play your job well to qualify for 1v1s as opposed to mindless DD where, again, you're killing 3-5 mobs per floor and using teleporters.
8) Culminates in a really cool final instance, which is more interesting than a reskinned Dungeon Boss with nominal mechanics because DD bosses need to take into account that your party finder may not have a tank or healer.
9) Actually good music.
10) Beating a 1v1 solo is a rare achievement, not unlike getting to floor 200 in a DD.