The three variants give a clear choice: 0,300 mm with specified load 9,20 kg, 0,350 mm at 12 kg and 0,400 mm at 14,10 kg. The thinner option is logical when looking for a smaller diameter, and the thicker ones are for a situation where the higher stated load is a priority. Compare the values with the task of the entire rig.
Before winding, check the spool capacity and distribute the fishing line evenly, without loose sections and accumulation at one end only. When cast, the guides must be clean and injury-free because a damaged edge can render abrasive resistance meaningless. A well-filled spool assists the exit of the line, but it should not be crowded.
The strength of a knot has value only when properly made a bond. Moisten the knot before final tightening, inspect it and remove a stretch with flattening, roughness or visible injury. UV protection assists fishing line in sun exposure, but does not cancel the regular inspection of the workpiece after fishing and contact with obstacles.
The choice here comes down to a practical balance between distance, diameter and the required load. For a cleaner route, you may prefer the finer variant, while the heavier conditions point to a next size. Leave enough reserve on the line, adjust the drag according to the whole tackle, and change the first meters as soon as signs of wear appear on them.
When you arrange your choices around MAGIC, the look at fishing lines and leaders for carp fishing helps to compare the role of the line and the leader in the rig. The wider framework you will find in Accessories for carp and bottom fishing, until fishing lines/Causes gives a clear next direction for reviewing related decisions.