Number of strands
The first point that manufacturers often emphasize is the number of strands. The higher the number of strands, the greater the linear resistance, the rounder the profile and the greater the glide. However, "more" isn't always better, as a braid with 8 strands will be less resistant to abrasion and backlash than a 4-strand model.
So, to overstate the obvious, I recommend you opt for 4-strand braids for casting (especially if you're casting big lures) and for crowded environments. Typically, 4-strand models are better suited to rubber jig fishing in cover or frog fishing in lily pads.
On the contrary, when using very light lures, for tactile and deep fishing, a smooth 8-strand braid with a hydrodynamic profile will be much more effective.
On the market today, you'll mainly find braids in 4 and 8 strands, but there are also references in 12 and 16 strands!

Diameter
Diameter is always an issue when it comes to braid. Those put forward by manufacturers are not always realistic when expressed in /100 of mm. That's why I recommend you refer to the Japanese standard, which is expressed in PE. You'll find braids ranging from PE 0.4 for ultra-fine fishing to PE 12 for giant bluefin tuna.
While for deep, tactile, current fishing, finesse is obviously an objective, it would be wrong to say that a fine braid is always the best.
As with the previous parameter, the environment in which you fish, the size of the lures you use and the fish you target will all be equally important in making your choice.
A thin braid will obviously allow you to cast further, but will be less resistant to abrasion and won't allow you to exploit the same braking power.
Casting or spinning
As we've already mentioned, when you're casting, you can be prone to casting errors and backlash, resulting in the loss of a lure. If with small lures you can afford to exploit all the advantages of a fine 8-strand braid, I recommend once again that when casting, you prioritize a larger diameter 4-strand braid for lures over 50 g, especially if they have aerodynamic qualities.
When you see the price of some of today's lures, it's hard to believe that we'd want to put them on a satellite in the middle of the water...
In spinning, this problem exists only anecdotally, so we can afford to use finer braids.

Coating
Some top-of-the-range braids feature a coating which is in fact a surface coating. This coating has two functions: to protect the braid and extend its life; and, above all, to optimize its gliding qualities. If you need to cast far and deep, then this criterion may be a priority in your choice.

The right leader-strainer combos
Today, it's customary to extend your braid with a fluorocarbon tip, not only for discretion, but also to be sure of breaking at the connection knot in the event of a snag.
To avoid having to remake our FG knots at the end of the line, it's important to make the right choice between the diameter of your braid and that of your leader.
So, with PE 0.6 braid, I recommend a maximum leader of 18/100. For braids in PE 0.8 and PE 1, you can go up to 23 and 28/100 respectively.
For stronger fishing, I recommend you use PE 1.2 braid with a maximum 33/100 leader and PE 1.5 braid with a maximum 37/100 leader.
With these associations, if you make a fG node you'll almost always break at the knot holding your lure and preserve your leader.

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