Huawei E5776 is a Cat4 150Mbps mobile hotspot, it can support up to 10 devices access to internet at the same time.
Huawei B593 is a Cat3 WiFi router, but the model Huawei B593s-22 can support download up 150Mbps, it can support 32 simultaneous Wi-Fi devices. And there are two external antenna connectors in the device, the external Huawei B593 antenna
could help improve signal and transfer speeds for Huawei B593 if the 4G LTE network signal is not strong.
In my own opinion, the network speeds of these two devices are no difference. Huawei E5776 is good for travelling, and Huawei B593 is suit for family entertainment and small business.