I use focus on whole body workouts for leaning out, but I no longer do this. I'm using heavy splits to prevent muscle loss during fat loss. I will throw in a whole body workout to hit the muscles twice a week, if I feel up to it.
Fat loss will happen with nutrition, but unfortunately so does muscle loss. I use nutrition to drop fat, heavy weights to maintain muscle.
I think XTrain is a great choice, but make sure you choose a challenging weight. I pick up a weight that will challenge me to desired rep range, but I do not try to match every rep, e.g. rep range is 16, but I am happy if I finish 14-15 reps and can't squeeze out the 16th rep with good form. If I make it to 16 and feel like I could have done more, my weight choice was too light.
The other thing I would suggest is not to focus on scale weight. Scale loss is not always a good measure.
Why Weight Loss is Not the King of Achievements | Fitocracy Knowledge Center