The painless striker is a rebadged product from another company. Edge, Quadzilla, Superchips, TS Performance, TST, Mads.. Smarty, Bullydog, Van Aiken, Dr Performance are performance companies that make performance boxes and or engine control module tuning.
There are many other companies that pay these ones to make their product in new packaging.
Your best bet for smoke and mileage is the Quadzilla Adrenaline, Quadzilla XZT+, Edge Comp, Smarty, TST Comp, Redline.
The smokiest and most powerful box on the market, in my opinion, is the Quadzilla Adrenaline with Pulse. This is the only custom tuning box so you can build the nastiest, smokiest tune in the world and then a few buttons away you can have your tame fuel mileage tune.
None of these boxes will really roll the coal except for the Adrenaline, without the addition of aftermarket injectors. The stock injectors are a great bottle neck for preventing tons of smoke.
Adding oil to your tank will help lube your injection pump and help make extra smoke as well.
Trust me, after two weeks of smoke, you will get bored and try to do everything you can to avoid it. The real goal is to make 600 hp and so little smoke that the local yuppies don't report you for pollution when pass them with your rear tires a blazin' !