I've been making a game system in which the core mechanic is using a limited language to describe magical effects, so it's a long way away from the intended purpose for both Toki Pona and Mini. However, I've found that Mini is far easier to work with and more expressive for my purposes because it's easier to put structure into the statements using the particles to indicate what part of speech is intended for each word. The selection of words also seems to be surprisingly well-chosen, because most of my use cases have been pretty straightforward to express.

I haven't really tried to limit the system to just Mini Kore (which is also 120 words, like Toki Pona, and would be a more direct comparison), mostly because Mini's current size actually seems to have the right feel. It might be an interesting experiment though.