Do not underestimate the physical book. For deep study, reading a print dictionary improves retention via spatial memory. The 6th edition print version is lighter than the 5th (thinner paper, but still opaque). It features (blue for nouns, black for verbs) which makes scanning the page 50% faster. However, searching for a word takes seconds in print versus milliseconds digitally—this is best for dedicated study, not quick checks.
One of the hardest lessons for learners is knowing when a word is formal, informal, or offensive. LDOCE6 uses an intuitive system: Longman Dictionary Of Contemporary English 6th Edition
Oxford includes collocations. Longman highlights them in bold within the definitions and provides a separate box of the top 20 collocations for high-frequency verbs. For example, look up "advantage": You immediately see "take advantage of, have the advantage of, an unfair advantage, a competitive advantage." Do not underestimate the physical book
Shows you natural word pairs. For example, for decision : It features (blue for nouns, black for verbs)