Ticklishness can vary significantly from person to person, and it often depends on individual sensitivity, context, and past experiences. For many people, the neck can be less ticklish than the armpits, while for others, it may be the opposite.
The armpits contain a high concentration of nerve endings, making them a common ticklish spot. The neck, while also sensitive, generally has a different level of ticklishness due to fewer nerve endings