Upgrade/update HD51

[avalon65]

I have been looking at the VU + Uno as an upgrade to my Mutant HD51 box, but the price was a bit more that I wanted to pay. Also, as the zgemma H7S and Octogon SF8008 boxes were recommended in other threads, I have looked at those as well.
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I have a twin cable satellite feed in, and would want a box which has twin receivers. My HD51 has a fitted hard drive, and the zgemma H7S has that option as well, but the SF8008 has a usb hard drive option. Is that a hard drive in a usb enclosure plugged into a usb socket.

Also what is the difference between the 2 SF8008 boxes, where 1 has 5 stars and 3 reviews, but the other has neither.
Edit:
The one with 5 stars and 3 reviews is a combo receiver and , if I read this right, it has twin satellite receivers, DVB-S2X, and DBV-C/T2. This box is cheaper than the other one, which does not have a C/T2 receiver/connection.

Looking at the picture for the back of both receivers, they both look the same with 1 satellite and 1 C/T2 connections.

A further point is that the SF8008 has:
Hisilicon Hi3798MV200 Huawei
- Quad Core 64Bit (4x 1.6GHz) 15000 DMIPS
- Flash 8GB eMMC
- RAM 1GB DDR4

Which looks impressive comapred to my HD51.

The zgemma, however has:
ARM Brahma 15 Dual Core 1700Mhz 12K DMIPS
​BCM7251S Dual Core Mainchipest


Are there any other comparable satellite boxes which have roughly the same specs as the SF8008, or should I just go for the SF8008 , with 5 stars and 3 reviews.

Thanks