I like to pull heavy from the floor at least 2x a month. So if I was pulling once a week I would alternate regular deadlift with deficits, speed pulls, rack pulls, chain DL, etc. Personally I like deficits but I'm not a big fan of rack pulls. I've done some chain work which I like but have not tried any band work.
But I still credit most of my pulling strength to regular deadlifts. If you want to be a strong deadlifter, you must deadlift. I got to 405 just by doing heavy singles every week and to 500 without any special exercises but with better periodization.