Your favorite adavaced learners dictionary?

Which advanced leaers dictionaries are preferable to the others for you؟

When you see a new word, Which dictionary do you prefer to use
why؟

Here's the most popular advanced leaers dictionaries i've seen
:

Longman Dictionary of Contemporary English
Oxford Advanced Leaer's Dictionary
Macmillan English Dictionary for Advanced Leaers
Cambridge Advanced Leaers Dictionary
Merriam-Webster's Advanced Leaer's English Dictionary
Collins COBUILD Advanced Leaer's Dictionary