There really isn't a standard. The vast majority of firewire-based cards are bundled with Adobe Premiere. But then again they don't actually do editing in native DV, they convert over to a different compression format like mjpeg.(posted 8995 days ago)One exception right now is FAST's DV Master Pro, which does native DV editing and uses a special version of In-Sync's SpeedRazor software.
I assume you're trying to choose an editing system, and it's pretty much impossible to offer intelligent advice without having a better idea of your editing needs (type of projects, quality needed, importance of getting real-time effects if you do pro editing and charge by the hour, etc.) and your budget.
-- John