My choice is 40lb braid for everything. This is thin enough to cut through the water, and thick enough to resist abrasion from the bottom and repeated casting with heavy sinkers.
I hate losing fish and would prefer not to hook one than to snap it off. With the murky waters in my area, thickness is not an issue anyway, so I only add a flourocarbon leader (22lb) when moving to clearer areas or when fishing competitions (9lb).
This is the same line I use for tying my rigs, with the exception of 30lb mono if targeting rays, which often come in tail-wrapped, or 100lb mono if after tope.
It may sound crazy to be using what is effectively a light line, however on a kayak, fish are brought up to hip height rather than the high gunnels of a boat. As a result, they are easily landed by hand, and I don’t set my drag at even half of that pull.
40lb line suits me for almost all my fishing