I have used a couple of methods. Here is my opinion on them.
The gravity filter works ok, but doesn't really go very fine. It will get out enough that there will be very light amounts of sediment if there was any cloudiness in the wine. It lightly polishes. Advantage is that it doesn't really take out any flavor, but will help get out larger particles. If your wine has a pectin type haze, it won't do a whole lot. Good thing, cheap, works ok and cheap (yes, I said cheap twice! LOL).
Cartridge filters can do about anything you want. Rough filtering all the way to .45 absolute (sterile). The problem with these, you can filter out flavor. I don't care what anyone tries to say, it does affect flavor. How much might depend on the wine. Lately, I've been experimenting and have found a way to get it filtered with only very minor loss in flavor/color. The problem with these filters, the cost a lot and they are very efficient (meaning they can pull out flavor, but they can even filter out yeast). The good thing about them, they will clear cloudy wines and polish very well.
I am still a huge fan of the old method. Let it sit. We will, in time, invest in cooling tanks. We will use them in fermenting, cold stabilization and cold separation. We love to experiment, so this will open up a few avenues that I've been wanting to explore. When we get there, I'll post up some of my new endeavors. As of now, still trying to perfect the commercial aspect of wines we've already made before.