You are working on a fork glide.
Yes, pure skill wise, flatland is much more difficult. At the pro level, flatland is completely incredible.
I would have to say this is consistent with how dangerous it is though. Since you are less likely to seriously hurt yourself like you do on dirt/vert/street you have more chances to try stuff until you get it right.
30 tries to get a line on street? Try 3,000 tries to hit a trick for the FIRST time on flatland. Some tricks take years to learn. I don't consider it an insult to the other forms of riding. The pros within each discipline are completely insane and phenomenal. But, for pure difficulty/skill involved in the tricks flatland has the edge.
If people could ride street and never get hurt, the tricks would be way more crazy than they are now... but people are killing themselves (litterally) when riding street/park and one broken bone will put a rider out of commission for months... or more.