The difference is the welcome screen icon is ready-made ; a player has to "make" his own slots. As well, once a player has success with his first 1-at-a-time method, that confidence boost will get the job done. Mind you, IF I was playing some other paths and I experienced the 8-slot method I might have advised it. But it would still NOT be the best practical method due to too many steps and lack of confidence boost. I'm convinced this is true for the wider spectrum of DMD players (for a different game, OK, I might advise the 8 slots).
"Many a drop is spilled between the cup and the lip"...