These sit a tier apart, so it is need versus want. The Alpha EVO 12 is a 12 Nm mid base with the smoothest signal in its class and strong value; the SC2 Pro is a 25 Nm reference flagship with class-leading build, the best software polish around and more torque. On the axes that decide flagship feel, the Simucube leads; on price and value, the Simagic does.
For a lot of drivers the Alpha EVO 12 is all the base they need - clean 12 Nm, active cooling, a signal that gives up little to pricier hardware. The SC2 Pro is the buy if you want the flagship experience and the headroom, and the extra $236 is worth it to you. Decide whether you are shopping mid-tier or flagship and the pick follows.