Is this current spider-man? If it is than his armour will make it hard for deadpool to be a big factor in this fight. If it is pre secret wars version than the team probably wins, all though not sure if deadpool and deathstroke would work well together. Their personalities are very conflicting.
Peter has much better resources as far as I know. Slade is an amazing tactician in the new 52 so I wouldn't be surprised if the team wins but Peter has more going for him.