use braid as my main line. But always use a fluorocarbon mono leader. Leader is within 2- 8 test
Works for me all year for all species. Not sure if line visibility matters much but if does, fc is the least visible - just in case. But f/c also seems to have less drag when working lures either vertically or horizontally. The least line bow is IMO important for sensitivity.

Mono is also ok in 4-6 lb test as a leader. Never cared for straight braid except when fishing for larger fish species.