You may take that the B315 straight into consideration

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Huawei has unveiled the 'industry's first' 300mm-depth IP platform with 20G/40Gbps capacity. Huawei claims the CX600-X1 and CX600-X2 (CX600-X1/X2) metro services platform (MSP) enable IP intelligence on metro network edge for Huawei optical network , drive convergence, improve capability and adaptability for full-service deployment and structurally reduce CAPEX and OPEX, which help operators to make full-service broadband metro area network (MAN).

According to Huawei, rapid expansion of broadband services drive today's metro networks evolving from pipe-type to full-service bearing, which necessitates IP intelligence to metro edge. This requires compact, yet powerful, IP equipment which could sit with massive access nodes to pay for the not enough IP capacity for traditional access equipment. Huawei's CX600-X1/X2 MSP addresses this matter by having strong IP capability along with a compact size (220mm depth), suitable to become hosted inside same 300mm-depth standard cabinet as access nodes including DSLAM, MSAN, and transmission equipment. The CX600-X1/X2, as well as Huawei's CX600-X3/X8/X16, is considered to enhance IPTime broadband metro solution that ensures fast and flexible full-service deployment, providing more abundant and intelligent services for users.

The Huawei B593 doesn’t have your complete suit of Above function. And after that the B315 has enhanced with so much function. B315 can get together an analog phone outside the back end RJ-11 vent. If your inserted Simulator card voice connections, my router can simply therefore regularly be used about outgoing together with incoming cell phone calls. However, my router could only facilitate phone calls via my GSM and then UMTS cellular network. The particular VoLTE might be not and as well available in huawei B315, plus the particular voice conference calls over my Internet in any case of your inserted Sim card card are generally is not necessarily supported.

Back to become able to the question, should anyone replace your B593 to B315? It depends.
From ‘network’ band side, if you wish so that it uses the particular router under FDD 700mhz, then B315 can be your choice. In order for employing your router underneath TDD 1900mhz, B593 is nice.
From your speed side, if you would like to receive a high speed on your own mobile network Huawei GPBD. You may take that this B315 right into consideration. A single thing you must note, the B593 performs a faster data transfer rate all over weak transmission area in comparison to B315. If you desire to gain some great benefits of B315, which is larger to put within the outward antenna.