You really (or reely) have to chose what suits you best at the end of the day. A big spool that is only half full is pointless and can inhibit casting if you are fishing light. But a spool that holds line right up to the rim can cause bird nests and loops in certain conditions, windy for instance. I have 3 reels with 5 spools and choose, for instance a "full" one to fish light or surface fish in good conditions, and I need a bit of distance. When bottom fishing, or ledgering, I put on a spool that has over time lost a bit of line and is not full, but also not ready for a new line. If how to set you line up on your spools is your biggest issue when fishing yo are lucky indeed. :)) Bait and groundbait presentation drives me nuts. And hook size choices, and my rod rest set up for conditions, and...….. most things. :))