With a straight flush draw on the flop I would go for a raise in position since you have so much
equity in the hand, an openended straight flush draw your about 60 percent to win by the river and about 49% with a flush draw and gutshot, assuming your opponent is not drawing to a better flush/straight. So its a good spot to put pressure on your opponent if your heads to either get him to fold and win the hand now or to win by the river about half the time. How you play a straight draw or a flush draw by themselves with position will depend a lot on pot
odds, your opponent, and your implied odds as well as how many people are in the pot, so I'm sorry I can't give you a definate answer to that one