During the recruitment boom in the early 2010’s there were a few folk who turned down offers for short-haul to hold out for an offer on long-haul. During their wait BA bought BMI and introduced a new pay scale so not only did they lose 300+ places of seniority, they also lost out on half a million quid of career earnings.
You never know what’s around the corner so bank the first offer is the most sensible advice.