Are Amazon titles short and readable, or long and wordy? Can different variations with different titles be more conducive to traffic acquisition?

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Usually on the product page, for the multi-variant product, I have been following the title is basically the same, clearly marked different specifications of the idea to create links, today suddenly found that tracking for a long time a link title has changed greatly, suddenly made the following two thoughts:

  1. Are different variations of the title equally good, or are different better?
  2. Is a short title of 80 characters or less better, or a title of 200 characters with more keywords?
1 Answers

If the budget is large, the product quality is excellent, willing to burn advertising, it can try
If not, then honestly bury the key words. Type in small words slowly and think about it later