For spinners it's tough to beat eight strand braids , the good ones are silky smooth and cast a mile , they also tend to be less noisy but they cost more .
I think the majority of anglers fish four strand lines because they are cheaper and they perform well on spinners and conventionals , they also tend to be a little more abrasion resistant but that varies a great deal from line to line.
If max distance, quietness and smoothness are a top priority then eight strand would be my choice but if you just want a dependable affordable braid i would stick with four strand.
On another note , superlines and braids do stretch , they don't stretch much but they do stretch , fireline fused has very little stretch compared to most other lines out there averaging between 2 - 5% while most true braids average 5 -7%.
As far as wind knot's , blame the angler in the overwhelming majority of cases and secondly the reel , some reels are notorious for leaving gaps at the very top or very bottom of the oscillation stroke and it won't matter how attentive you are, it will be a lost cause , they are wind knot machines.
Even adjusting line lay by adding or subtracting washers won't help because the reels are defective in their design , the spool measurements and oscillation stroke don't match up correctly. Luckily this is very rare and mostly applies to some reels that are not in production anymore.
If the above two reasons aren't it then it's probably a terrible mismatch between reel and rod , not very common but it happens.
Just follow the standard anti wind knot protocol and you'll be fine.