There are some characters that are essential to have an EX build, like Cloud for his Defense EX-Crush, Sephiroth for his Heartless Angel and Gabranth, for him to actually do some HP damage :P But for my Zidane I hate to do an EX build, he gets way to jumpy and jittery when he's on EX, making it harder to time dodges and blocks. I rather have him in normal mode, bringing on the pain with his BRV ---> HP combos :P
Plus his EX burst sucks and does too little damage.
Current PC Build
CPU - i7 8700K 3.7 GHz (4.7 GHz turbo) 6 cores OC'd to 5.2 GHz with Watercooling (Hydro Series H110i) | MB - Gigabyte Z370 HD3P ATX | Gigabyte GTX 1080ti Gaming OC BLACK 11G (1657 MHz Boost Core / 11010 MHz Memory) | RAM - Corsair DIMM 32GB DDR4, 2400 MHz | PSU - Corsair CX650M (80+ Bronze) 650W | Audio - Asus Essence STX II 7.1 | Monitor - Samsung U28E590D 4K UHD, Freesync, 1 ms, 60 Hz, 28"