I won’t go into individual company strings, but I thought it would be helpful to know how each material and each type of twist works with your yoyo.
Type 6 and Type 8.
There are two major kinds of string twist in the yoyo string world right now.
Type 6 and Type 8. The number refers to the ply of strings with the number of folds to create the final twisted strings.
So type 6: ||| twisted, then folded in half, 3x2=6
Type 8 being: |||| twisted, then folded in half, 4x2=8
I have also seen a 1x12 created as well.
Type 6 is thinner than type 8. For 1A play, this creates a huge difference. Type 6 is less responsive due to the string being thinner, thus creating less friction on the side walls of the yoyo and response.
Type 8 is thicker, and this results in more response, and also tighter binds for regenerations.
For 4A, the same is applied, type 8 tends to be better for regens but also creates snags easier.
For 2A, the thicker string will make loops quicker, and also loop downward which many players seek, but due to the thicker string combined with a small gap, spin times are sacrificed.
Cotton: The most traditional yoyo string. The original. This string tends to be cheaper as cotton is a cheaper material to use. Good budget string. Issue though is that this string reacts to humidity. Cotton soaks in moisture and can leave a string feeling quite grimy in certain conditions. For fixed axle yoyos, cotton string is a must and I will go into this more in detail in a bit.
Polyester: The standard for most yoyo players today. A bit more expensive than the cotton string, but plays much more slick and tends to have brighter colors. This string does not react to humidity as much and has a decent lifetime. This string is not to be used for fixed axle yoyos as they can melt due to the friction. This also applies to many 2A yoyos as well, specifically 2A yoyos that use starburst for response such as raiders and unleashed.
50/50 blend: A mix of Poly and Cotton. A bit more abrasive than Poly but not as abrasive as Cotton. This is prime string for 2A as it will not melt as 100% poly, but will play slick as 100% poly would.
Nylon: A highly slick string that is heavier than poly and cotton. This string is great for slacks as its weight allows for greater flow and more effortless whips. This string plays very slick and tends to last for a very long time. The issue with this string is that it tends to not hold string tension very well, which could be bad for suicide tricks. Most nylon string is also quite a bit thinner than cotton and poly strings, so using these for 4A and 2A would not be recommended.
Now of course there are many other obscure materials that you may find in strings. Kevlar, string metal, gold fibers, etc. But those 3 materials are the most common you will see. Now there are many blends of such string in the market today. Based on what you know, you can deduce how a string might play by taking into account what blends the company is using in their string.
On that note, hopefully now you can choose a string that suits your needs based on the materials and ply that I have listed.
As for maintenance cleaning the bearing and keeping it lubed with a drop of thin lube is really all you will need to do for a good playing throw.