Choosing the Block, the Cap and the Finish
Most people arrive at this decision assuming there is one kind of block. There is not, and the choice is worth ten minutes because you will look at the result every day.
Matching your neighborhood, or deliberately not
The safest-looking wall is the one that reads as though it has always been there. That usually means matching the block color, the size and the face texture that the surrounding houses already use, and carrying the same cap detail along the top. On most Tempe streets there is an established look, and a wall that ignores it draws the eye for the wrong reason.
There are good reasons to depart from it. A courtyard wall inside your own yard can be a different color from the perimeter, split-face block gives a heavier texture where you want the wall to feel substantial, and a decorative block panel can let light and air through a section where a solid wall would feel closed in.
Whichever way you go, the cap is what finishes it. A continuous cap along the top of a run is what makes a wall look built rather than assembled, and it also keeps water out of the top of the block, which matters more here than it sounds.
Pilasters, gates and the openings
Pilasters are the thicker columns spaced along a wall. They stiffen a long run and give you somewhere solid to hang a gate, and they are also the main opportunity to make a plain wall look considered. Where a gate is going in, the pilasters on either side get built for it from the start rather than being adapted afterward.
If a driveway gate is part of the plan, say so at the estimate even if it is going in later. Building the openings and the pilasters for it now is far cheaper than opening the wall back up in two years. The same goes for anything that has to pass through: irrigation, a conduit for a future gate opener, a drainage sleeve.
Iron gates and automatic openers are covered on wrought iron fencing and automatic gate repair.