the main difference is a power vr sgx 540 vs sgx 543.
the cores are cortex a9 but most omap 4 4430s are 1.0 (Bionic, archos g9 80 to 1.2 ghz (razr phones), and apple clocks the a5 at 800 or 1ghz (ipad).
so for 3d the a5 will be faster. the omap will probably be faster on computational stuff given its clock speed advantage