They are one family at three sizes
Micro, mini, and regular pebble are not three different products. They are the same idea, natural stone set into the pool surface, at three aggregate sizes. The size of the stone is the single variable that changes how the finish feels, how it grips, and how the color reads. Picking among them is really picking how much texture you want underfoot.
Think of it as a spectrum. Micro sits closest to plaster, smooth and quiet. Mini sits in the middle and is the most-specified for a reason. Regular sits at the bold end, with the most visible stone and the most grip.
Micro pebble: nearly smooth, more durable
Micro pebble uses the smallest aggregate. Underfoot it reads close to traditional plaster, which is what people want when they like the smoothness of plaster but want the longer life and better stain resistance of pebble. The color is even and calm rather than dramatic.
Choose micro pebble for steps, tanning ledges, spas, and any pool where bare feet spend a lot of time on the surface, or where you simply prefer a smoother feel without giving up pebble durability.
Mini pebble: the everyday standard
Mini pebble is the middle of the spectrum and the most-specified finish in the line. The stone is visible and gives the water real depth and character, but the texture is moderate rather than rough. It carries the widest water-color range of the three.
Choose mini pebble when you want visible stone character and a rich color read without the strongest texture. For most residential pools it is the default for a reason: it balances feel, color, and durability.
Regular pebble: maximum grip and the most natural read
Regular pebble uses the largest aggregate. It has the strongest texture, the most grip, and the most rugged, natural-looking surface. The water reads deep and stony, which suits larger pools and naturalistic designs.
Choose regular pebble when grip and a bold natural look matter more than a smooth feel underfoot, for example on a sloped entry, a beach entry, or a large pool meant to read like a natural body of water.
How to decide in one minute
Start with your feet. If you want close to plaster smoothness, go micro. If you want visible stone and the widest color range without rough texture, go mini. If you want grip and a bold natural read, go regular.
Then confirm with samples. The difference between micro and mini is hard to judge on a screen and obvious in your hand, so order across the sizes and check them in your own light before you commit.