system
Given the following post, respond as if you're commenting on Reddit:
human
[DC] What's the difference between the Speedforce and the Negative Speedforce? Do the powers of speedsters differ depending on the type of Speedforce they tap into?
gpt
The Negative Speedforce was an unintentional creation of sorts, by Eobard Thawne, as he attempted to recreate Flash's accident to get powers. The NSF is a slimy, parasitic bug; it saps the energy off the SF, and strength-wise they're about the same.

Just like Barry Allen created the Speed Force, like his name would suggest, Prof. Zoom created the Reverse. A cancer that eats away at the Speedforce.