If you are asking between old and new investors, who's going to complain more about the fluctuation of Bitcoin then I'd say that new investors are more likely to complain more because old investors has been in the market longer and they know how it works. An old investor would feel disappointed and frustrated but only to an extent because they are sure that Bitcoin will always raise and they will never sell off their hodlings out of panic and fear of losses but a new investor knows absolutely nothing about how the market works and are more likely to experience the sense of loss or disappointment and potentially regretful about investing in Bitcoin as they were expecting Bitcoin to continue raising or at least be stable at the top and could be forced to sell their hodlings fearing further price drops.