my opinion on the battleline are
Spider-riders are fast and mobile Glasscannon that need the most support and synergy from the other Spiderfang units, good build in abilities
Moonclan stabbas are the most reliable options, the have a lot build in support with their equipment, require them to be in large unit for max effectiveness
Troggoths heavy hitters good against tanky units, has a blend of shooting, defensive, and offensive abilities kind of expensive
Squig, cheap offensive choices not as mobile as spider riders but just as good Glasscannon output, doesn't have the greatest build in abilities like the others do.