I actually like 6011 better than 10 for general work but havnt tried every flavor they make in 10 either. Its good to be familiar with 13 as on occasion it is found in garages usually with AC, not very popular here on real jobs though.
It does take some practice to learn this well. It cmes and goes with some people for the first couple years and then its about like a bicycle, you can till ride one and no one notices you are not perfect, you would need to ride regular to be competitive. Same for welding, to the public and even other welders don't give it a second glance but if it got to being real critical inspections there would be problems,,, none of which matter in most practical apps, may not even matter to the job hand but wouldn't pass a fine eye.
Also some practice and work lend itself to confidence and a guy can slow down and really organize some or these joints, fine arc length, overlaps to arrange grain structure for critical test as some or the bends and charpy's can be, you can see it in shots too.