S5700-28C-SI not only provides 24 Gigabit interfaces, but also supports a service slot, which can provide up to 4 10 Gigabit interfaces, so the packet forwarding rate should be 24 *1.488+4 *14.88 = 95 mpps.
The grades of the two devices are different. S5700-28C-SI can be used as a 10-Gigabit convergence layer, and its scalability and reliability are much higher than S5700-24TP-SI.