Sparkey,
For DURABILITY the consensus in our area in North Dakota is by far
Sonolastic Self Leveling in small or large tubes to be used with a caulking gun. For vertical application (since you mentioned concrete block) Sonolastic has a stiffer version. I hope this helps since I believe you are far enough north in frost & thaw areas ... so it is relevant to you also.
Since labor is also involved the difference of Sonolastic lasting for decades vs a few years (some caulks) is a huge value based on actual experience.
mike
www.kingkoin.com