Monitoring your speed is paramount to success. This speed sensitivity also provides options. Now, I mark some fish a little higher, say 36 feet, just hit the throttle and your lure rises slightly. The same thing goes for raising your lures over a hump or reef. Once you are past the structure slow back down and your lures are precisely at the depth you started.
Snap weights are also speed sensitive.
More or less sensitive is a matter of opinion. With leadcore's thick diameter the entire length of the line offers resistance. With snap weights the bulk of resistance is placed right at the clip and weight. Since I know how deep my lures will run on a given line, I release the prescribed amount of line put on a snap weight and release the necessary line to reach my desired depth. It sounds more complicated than it really is.