What's the difference between freewave & a wave

If we take the same volume: Freewave boards usually have more mass in the tail, are maybe slightly wider especially in the rear section and have a faster rockerline (the curve along the length of the board, like how high is the nose etc...), wave boards are usually narrower especially in the tail section and have higher rockerline to cope with the waves, it is also slower.
Freewave will plane faster than a wave board but will be more "nervous" and faster than a wave board, a wave board will be looser easier to carve but a freewave could provide options to do some basic freestyle tricks. Freeride board will have a flatter bottom shape (not so many concaves as wave or even freewave) have more slalom like stance option for the footstraps for speeding and will be thicker in the rear section. It will plane easily and will prefer a flat water and will not handle in choppy conditions as well as freewave and wave boards, it also doesn't feel as loose as wave or freewave board.

In my opinion Freewave is "the" choice...