This would be a weird a$$ battle cuz their the same.Symbiote is stronger but scarlet spider has impact webbing.
Scarlet Spider did battle Venom, while covering for Peter, and I believe he gave him a bit of a kicking because his Spider Sense worked and he fought differently. Which had him off guard.
How he would fare against a symbiote enhanced Spider-man is a bit different. The symbiote would boost his strength, endurance and recovery. Both fighters would have spider sense making for a protracted fight. Impact webbing is nothing special, certainly nothing the symbiote couldn't counter, so I would give the fight to the ebon-clad-wall-crawler.