cherry picker
US /ˈtʃɛr.i ˌpɪk.ər/
UK /ˈtʃɛr.i ˌpɪk.ər/

1.
a person who picks cherries
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The cherry picker carefully selected the ripest fruits from the tree.
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Being a cherry picker requires patience and a good eye for ripeness.
2.
a person who selects only the best or most desirable items from a range of choices, often to the detriment of others
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He's a real cherry picker when it comes to choosing tasks; he always takes the easiest ones.
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The company was accused of cherry picking the most profitable clients.
3.
a mechanical device consisting of a long, jointed arm with a bucket or cage at the end, used for lifting people to high places, especially for maintenance work
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The workers used a cherry picker to repair the streetlights.
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A cherry picker is essential for reaching high branches during tree trimming.