@jd1234.
Click on "Puits" (instead of "Dimensions") to see levels 0-99.
I'd say Nightmare Tuber is probably easier than the HoF nowadays (because it's gotten harder), but I suppose I've never really tried to reach the HoF, so I can't say for certain. Since your high is 3.2, you should be able to get in within a month, two maximum. Just promise me you won't try too hard this week, yes ? I want to do it this week.

Regardless of which is easier, though, I'd say you should beat NT first. It'll give you a load of experience that will help you get an even higher score once you go back to score runs.