I'm a fan of MI cartridges, and while these aren't in your price range, the comparison might hold true for more affordable examples in the two companies' line-up of products. I recently bought and compared a Nagaoka MP-500 and a Grado Lineage Statement 3. I've got 80 hours on the Grado, and it still doesn't excite me one bit. It does its job, but it doesn't make music - it's lifeless. The MP-500, on the other hand, absolutely rocks. Delightful, fun, maybe just a little overly bouncy. But a real bargain compared to the Grado.
Normally I use a London Decca Reference, but it has gone for a rebuild before John Wright (the maker) retires in November. So these two above, plus a London Jubilee and a BM Ruby 3 have been keeping me occupied. If I outlive the Deccas, which isn't likely, the MP-500 and the Ruby 3 will keep me very happy. I now understand why Grado cartridges have lost a lot of the popularity they once enjoyed.