What does 160 gigabytes on a solid state drive equal out to on a normal hard drive?

I am thinking about computers and i do know what a solid state drive is..but i wondered which would be better..a 160 G.B. solid state drive and a 2 terabyte 7200 rpm hard drive or!!!!!!!! 2 (2 terabyte hardrives with 7200 rpm)............. Also how much would a solid state drive equal out to on a normal hard drive