The general trend in fishing right now among pros is the increase in spinning reel spool size. The biggest contributing factor to this are the benefits that come with having a bigger spool. For one, the ability to cast further with finesse techniques due to having more line on the spool in the first place. The more water you can cover the better. The second main factor is that it increases the rate that you can reel the line in. More line is reeled in with each turn of the handle due to the circumference that goes with having a wider spool.