In what case the throughput ability of a system that can handle two processes would be bigger

Question

In what case the throughput ability of a system that can handle two processes would be bigger,1)if them two would be i/o bound or2) the 1st cpu bound and the other i/o bound?

Answer 1

Other things being equal, the second case, because there wouldn't be as much contention for the CPU or the I/O devices.