Personally in recent years, I prefer to shot with 2 tripod legs in the front ( in the direction of my lens' view) while I straddle the single leg. The least important reason is I tend to knock either legs if I had the two legs positioned to my rear of my camera direction. For one, I tend to keep my legs relatively to the same width as my shoulder for stability and if I move too much to my sides, my feet knocks into either tripod legs.
The main reason why I prefer the single leg between my stance is if I want to make slight adjustment to the tripod's forward and backward tilt ( sometime you need to do this if you reached the limit of your tripod's angle like tilting back to show something high up at an angle. It is easier toadjust one leg then two legs of the tripod.
Also as I tend to lean against the back of my camera when shooting with the tripod, I something exert abit more force on the front portion of the tripod which would translate into forces pressing down on the tripod legs in the forward position. So with two legs in front instead of a single leg, the two legs takes my weight better and not give way and start to lower itself as you lean into the shot. I use a 3 way screw lock tripod head which I would tighten just enough that they is some resistance to movement but will still "give" when I move it about while holding the camera body that is fix to my tripod. This give me a more stable platform to shoot "freely" but it does exert some weight onto the tripod legs so...two legs towards the fronts works better for me in that sense.