The welding machine can make a big difference, a good welder can make a bigger difference, a very poor machine makes learning very hard.
Knowing you have an AC machine and can get AC/DC rods of various flavours is also a difference.
I have used 7018, 7024,7014,6013,6011,304,308L, and so on. Sometimes good old 6013 just fits the bill, nearly use it with eyes closed, ya, I know, "farmer rod" sometimes 7018 will be abit finicky, but the extra 10,000 is needed.
I have used 100s of lbs. of Stody and Ni-rod 55 in mig, but special use only.
The old stick arc welder works in the wind, a gas mig nearly useless. StickArc welder does not need liners, a drive motor, tips etc. Yes, I have 2 stick buzz box units, 2 gas migs, a spot welder, and oxy/ac set up.
I guess if I had to pick, it would be a toss up between 6013 and 7018, depends on welding machine and job.