I teach welding for the USAF. Technique in this case doesn't really matter. If you're good at butt welding do it, if not, joggled lap welding is more forgiving and easier. Also depends on what you're welding with. Vertical or horizontal butt welds with a oxy/acetylene torch are a pain in the butt! ;>
The only possible disadvantage to the jogggled lap is that you have an exposed edge inside that could rust or trap dirt and such insdie (which leads to rust) if the joggled part is to big.
I'm not an expert welder, but am familiar with the techniques. I just have to be good enough to show the students what to do (and NOT to do). There are some real pros here at the school that have been welding much longer than I. I ask them things all the time, and get them to do any delicate work. Got to know your own limitations!