The Asus fan control software is very good, i just use that.I'm not an expert on fan controllers but they are a nice addition. I just don't like the look of them. There a little ugly. Haha.
I tend to use splitters but these may be a bad idea as I use a few duffebt fans I found the splitter wasn't working properly.
Just so you know, some case now cone with fan controllers in them (on the back of the motherboard tray) I know the enthoo primo has this but I'm sure others do too.