Flat bank sinkers... Also known as no rolls are a good sinker to use. Some say that in really strong current they can flutter and twist on the way to the bottom but I've never had this problem.
With sinkers there are a few variables that you need to consider when using.
1. Current Speed.
2. Weight of the bait.
3. Bottom structure.
The benefit of no rolls is that once they land they usually won't move around too much. You don't want movement once your bait is on the bottom, if it moves any considerable amount and there are snag's you run the risk of your line fouling up in rocks or whatever else is down there, increasing your chances of getting hung up or snagged and loosing your tackle.
Keys things to keep in mind keep your line taught.... don't let a lot of excess line out when letting your rig come to rest on the bottom. If you find that your bait is moving after you've settled on the bottom you need to increase the weight to hold.
Hope this helps out. I know others have good input that will help.
thanks
Larry