I rode both last year. Mala Compra was short, with some fun hills and drops in the back, but not as good as alafia/balm. The regular stuff is pretty boring, and the Black diamond stuff didn't flow very well, but was challenging with tech and up-downs. The trails are really well marked with notice of upcoming Difficult Trail Features, so you can get a heads up to skip the hard stuff (harder than North Creek/Rollercoaster).
Graham swamp was pretty good, more sustained climbs than alafia and balm, but sandy in spots. It is similar to North Creek with more Climbing and Sand, and some options for hard stuff like drops, rock gardens, and some steep wood Bridges similar to the Fingers at Carter.
I would make the trip to Graham Swamp from Tampa again for something different. I would not make the trip again just for Mala Compra.
Another park that was a bit of a drive from St. Augustine, but really fun for intermediates is Chuck Lennon Park in Deleon Springs, FL. It's about an hour away from St. Augustine, but was more fun than Mala Compra. If you are further south towards Palm Coast, I would check it out.