In DT they give negatives more for errors and missed tackles so for example a player like Mitchell Moses is not relevant in DT as he would in Fantasy. Also they give less kick metres. Do reward tries and line breaks a bit more. Try get good minute base players in the hooker and forwards and if can get good minute base players in centres like a 2nd row/centre duel in the centres that can get you a leg up. Capewell for example is available in centres on here.
SC give bugger all for negatives in errors and missed tackles and rewards players even more with attacking stats and tries. So get lots of attacking stats and try scorers across the park in the team especially in the centres where teams are usually most different can separate you from the pack. Base players don't do as good on it compared to Fantasy and DT if they don't have attacking stats. Lot more luck involved because of trying to pick the attacking stat players and try scorers.
Overall just try to balance the team across the park well enough to get the best scores.
Nice summary. :-)