After leveling either of them to 60 in dungeons (not this fate nonsense that doesn't train players) either will start to seem easier. They are both staggeringly different in their playstyles but when you level either up you'll know what rotation works best and how to pull things off with either.

Neither are as difficult as machinist however, if that's what you're looking towards in fear of.

Just think if you'd rather spear something in the face with a massive burst and jump around or attack something with 100,000,000 wet rubber noodles.