Which one is the best Advanced Learner's Dictionary?

[supernj]

I found there are several Advanced Learner's Dictionary for ESL learners as following, but I'm not sure which one is the best. Could you guys give some comment or recommandation. Thanks in advance.

Oxford Advanced Learner's Dictionary, 8th Edition
Longman Dictionary of Contemporary English, 5th Edition
Collins COBUILD Advanced Learner's English Dictionary, 6th Edition
Cambridge Advanced Learner's Dictionary, 3rd Edition
Macmillan English Dictionary for Advanced Learners, 2nd Edition
Merriam Webster's Advanced Learner's English Dictionary, 1st Edition

[5jj]

The 'best' dictionary is always a matter of personal judgement. If possible, go to a bookshop offering all these dictionaries, and look up several words/phrases that have given you problems in the past. See which definitions and example sentences are clearest for you. List the features of each (for example: illustrations, special topic entries, coverage of phrasal verbs, idioms, words easily confused, collocations, usage notes, etc), and think about which are important for you.

[phamduc.minhanh]

Greetings,

I am a high school pupil from Singapore.

It depends on the learner. For example, the Oxford and Cambridge dictionaries often list British words and put American ones as variants. Merriam-Webster does the opposite. Therefore, if you favour British English, then go for the first two options. I think that they are the best for British English leaners. I cannot say for American English learners, but I often find Oxford American Dictionary installed in my MacBook Air useful enough in most situations.

Cheerio,

Pham Duc Minh Anh