I struggled with most rods until I tried 7014 and the drag technique. This rod produced decent welds so I used it for nearly everything for years. Eventually, after some skill developed, I started using other rods for specific purposes, ie 7028 jet rods for penetration, 7018 for vertical, various hard surfacing rods and so on.
Someone gave me some leftover 6011 Farmer rod awhile back. I ran a bead or two with it but I really don't know why I would use it instead of 7014 which is higher strength and easier to make a pretty weld with.
So I would recommend 7014 and the drag method to a beginner. Once you get some hours in the drag technique can be dropped in favour of maintaining a tight arc with the rod more upright and possibly adding a weave into the mix, if needed.
Everlast PP256
Everlast Imig 200
Everlast Power Ultra 205
P&H 400 amp A.C.
Miller 230 amp with Onan power