Both dramas are about wealth/status.
Tho, "The last empress" is more about revenge.
The acting is amazing and mature.
There's multiple issues throughout the drama that gets resolved pretty quickly. An issue doesn't drag on and on/stack on top of another.
It's not boring.
Beautiful love, wonderful life has a better romance as youove forward with the episodes.
"The last empress" has more action.
I don't want to spoil anything thing so I would go any further.
What is similar is the feeling you get as you watch it.