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How to choose PE Braided lines? Which is the best? (Dyneema(R), Spectra(R))
Braided lines of Dyneema and Spectra are Poly-Ethylene based filament lines. These lines are much stronger than classic mono-filament nylon, and now many anglers use them. It floats because it has 0.97 weight ratio, when water has 1.0 weight ratio. The line is braided with a lot of very thin fibers and it tend to have coating to protect the thin fibers. There are too many braided lines in market, and we should study before we use them.
Most differences of PE braided lines come from the material, way of braids, coatings and construction.
Material:
Dyneema or Spectra fibers are brands name of high-density poly-ethylene. Dyneema has upgraded fibers from original to following, and other manufacturer as well.

*Data from YGK
Way of braids: Not bradied, 3strands, 4strads, 8 strands
PowerPro, Spiderwire, Fireline and most PE braid line are braided with 4 strands. Each strand is composed of a number of very thin fibers. Braided lines with 4 strands are in the shape of square, but with thin lines it looks round.
There are a few PE braid lines braided with 8 thinner strands for more smoothness. These are mostly for offshore deep jigging, rated at more than 40lb-test, and they are expensive. They tend to have more body, but for jigging, it is not a significant disadvantage. Smoothness is very important because line has always high tension in jigging.
Some lines are braided with 3 strands, and it is flat. It receives more wind than 4-strand line. When lines are twisted, the 3-strand line shows more roughness.
There is none-braided PE line in market, which has PE spectra fibers bonded by hard coatings. The surface of the line is very smooth, and it is a great advantage. It has more coating material than braided line, to bond the fibers together, and these lines tend to be a little limpy.
From left, 8-strand, 4-strand, 3-strand
From left, Zenaq-Jigger Trust 40lb, PowerPro 10lb, Ripcord Si 15lb
Coatings: Hard coat, thin coat, non-coat
Most braided line are coated with some kind of abrasion protector because PE fiber has less abrasion resistance than monofilament lines. One of the hardest coating is on Barkley's Fireline and Spiderwire fusion. Fireline looks like one fiber, but it is braided with 4 strands and then coated with plastic coating. PowerPro has relatively hard coating, applied to each strand, and you may easily identify the braids of the line. YGK Power Hunter, WX8 and WX4 have thin silicone coating, and it is as soft as non-coated PE line. Ripcord and Spiderwire seem to have no coating on its surface.
Coating will give the line harder body, and it also make body slimmer. The slimer body also receives less affection by wind or current. But, harder line has more friction with guides in casting, and leads to less casting distance. PE fiber material itself doesn't have memory, but the hard coating has memory. Softer, less-coated lines require special care in handling to prevent tangles, but cast farther.
Considering the extent of added abrasion protection by coatings and the disadvantage of them, I prefer to use thin-coat line because it casts much farther, and retrieve much smoother. By using mono-leader, I can achieve the abrasion resistance, and don't much need it for main line. Currently, some nylon lines have 20times abrasion resistance to normal mono, and coated braided line may have only the similar resistance of normal nylon line.
Construction: 100% PE braid, hybrid construction with other fibers
Most PE braided lines are made of 100% PE fibers, but some lines have hybrid construction with mono filament, or other fibers. These hybrid fibers/filaments are used to add some tension to the line and improve the easiness in handling. One good example is Sunline Cast Away line, which has 4 PE fiber and 4 high-density ester filaments braided together. The line is famous for great casting distance and none of line-trouble for offshore casting purpose. Other lines have hybrid construction with PET fibers, which is inexpensive, but still stronger than nylon. In the past, I have used a hybrid line with single mono core, but it was not much good because the core pops up from braids.
Specifications of braided lines
Recommendations

From my experiences, I recommend 8-strands line for spinning reel if you will use mono-leader.
For bait casting reels, hard-coated Fireline and lines like Power Pro are still the best. Softer lines will get dig-in troubles.