Approach for irons?

I saw a video that I can not find again on here a few nights ago that was discussing where to stand when your address the ball. Now, I am new to golf and had a sick slice that was fixed by simply moving my stance to put the ball toward the front of my stance when I am driving. But I have heard 2 different stories for approaching with irons. I have watched videos that say to align the ball with your belt buckle for every iron and then others, like Martin Hall on the Golf Academy series, that say the ball should be closer to your left foot (RH golfer) then progressively move toward your belt buckle as you move from the low irons to high irons. Can someone tell me what is the actual best way to approach for irons?

Everyone is different, there are several different opinions you will get. essentially your higher lofted clubs should be played off your back foot and move forward as you decrease loft. Its hard to say without seeing were you are contacting the ground.

Play the 8iron from the middle of your stance and progressively move a ball back for higher lofted clubs and a ball or so forward for every lower lofted club, in my humble opinion...

Where is your swing bottom with your irons?  In other words, where do you consistently make a divot?

Unless you have stance width like Albert Pujols, that seems pretty tough to pull off.

Tiger and a few others advocate the 3 ball theory...essentially playing only 3 different positions in the stance. I try to basically do that because it's simple for me and I try to keep the setup fundamentals as simple and consistent as possible. I've added 2 special positions...I have a 'rear' position that's almost off my back foot, and a 'forward' position that's almost to my front. The rear position is to really trap the ball, the forward position is to try and hit a ball higher. I probably use those two special positions once, maybe twice a round total...and I probably hit a trap 4/5 times I'm using a special position.

I try to keep the ball near the middle of my stance, though, the 3 ball theory.

Because I have a strong grip and because I play a windy course with small greens most of the time, my error tends to be getting the ball too far back because I get into this rut of wanting to really control the ball and keep it down, and then I start setting up with remants of that approach all the time. It's not so bad I guess, but I start to run into issues with the 'long' clubs when I fall into that pattern.