Locktite is not as "supple" as Soft Lay. It is closer to Medium Lay line in that it has more rigidity than Soft Lay has. This is noticable even though the diameter of most Locktite used for crabbing is smaller than 1/4" which is the more popular diameter of Soft Lay.
There are varying degrees of "suppleness" in Soft Lay lines due to formulae used by different manufacturers. However, every brand of soft lay I have ever used/seen is more flexible than Locktite.
Keep in mind that "Locktite" is a brand specific line. Not so with Soft Lay. Only one company manufactures Locktite. Other manufacturers make line similar to, better and worse than Locktite and they have varying degrees of softness.
Other manufacturers make lines that are of different degrees of quality that can be termed Soft Lay. Soft Lay is a characteristic of a line, not a brand name.
This may be more info than you wanted to know.

Hope it answers your question.