BTW screws are all mass produced products so unless you pay a premium to your supplier for them to use a higher grade of metal or superior post treatment surely your screws and everyone else's screws are the same.
I do some woodwork in my spare time and I tend to use brass screws simply because they don't rust and stain the end product over time. However the torque on my screwdriver needs to be set carefully or the head simply breaks off.
Stainless steel screws are far superior but cost even more.
A few things are important - (a) material, I use only AISI 1022 steel and buy only from the reputable 中鋼 in Taiwan; (b) design, there are some unique designs that makes the difference between my product and others; (c) heat treatment, core and surface hardness cannot be the same, has to be hard on the surface and soft at the core there's a unique technique to this, also for heat treatment need to be careful of hydrogen embrittlement; (d) coating, this again is very important against corrosion. Lastly QC is very important not only checks the screws physically but also need to check its drilling speed, hardness, corrosion resistance against salt-spray (ocean) and chemical (acid rain) I believe we are the only guys in Asia selling screws who possess this unique lab for IQC. Give confidence to customers too.
Brass is good for wood, timber do contain lots of chemicals for certain reasons and these cause carbon steel screws to corrode so brass and stainless steel is good for timber however for stainless please be reminded to use only 3 series like 304, 305 or 316. 400 series is very common and popular and cheap but will have rust especially encounter chemical.