Gaming / Editing / Rendering build for around £1000

Seeing that my build is more expensive, I'll go ahead try to work out the differences:

The Xeon E3 1230 vs i7 6700 (3.4-3.8Ghz vs 3.4-4Ghz) both are 4cores/8threads and have the same stock clock, the i7 has higher max turboboost but to maintain high turboboost clock under rendering load, something better than the stock fan included with either the i7 or the Xeon has to be used which explain my choice for the inclusion of the Cryorig H5 Universal. The i7 has the integrated GPU which may or may not be relevant.

Gigabyte GA-X150M-PRO ECC vs Gigabyte GA-B150M-DS3H : Both are microATX boards, but the X150M is effectively the C232 equivalent to the more expensive B150M-D3H: featuring Intel LAN with better speed+CPU utilization, better audio configuration ALC892+more audio caps vs ALC887, and three chassis fan headers vs one.

Between the M7V and the MX300: the M7V will give better speed while the MX300 give a bit (19GB) more storage space.

EVGA SuperNOVA G2 550W vs Antec TruePower Classic 650W : The EVGA is a very high quality unit, the 550W capacity is just the right amount for the build and it is a fully modular PSU which help with the cabling. The Antec (OEM by Seasonic) is also of very good quality but it isn't a modular unit, picked the higher capacity because the TP550C is not cheaper by much.

Phanteks ECLIPSE P400 vs Deepcool TESSERACT SW RED, this is where there are lots of differences:

The P400 offer 2x USB 3.0 on its front (top) panel while the Tesseract offer 1x2.0+1x3.0; the misc effect this does have is 1x 3.0 cable vs 2x USB cables on to your MB.

The window on the Tesseract is big enough that it leave the 2.5"/3.5" bays partially in view, the window of the P400 is big enough to see entire innards, but its 2.5" bays are behind the MB tray while its 3.5" bays is hidden under the PSU cover (which would also hide the non modular cables of the TP650C). The P400 dropped all 5.25" bay for a cleaner look while the Tesseract maintain 2x 5.25" bays allowing the use of optical drives, fan controllers, etc... + a section of its front look as if it can take a zip/floppy drive .

Tesseract's expansion slot covers are all the punch out kind (once removed they're open for good) while the Phanteks' are reusable (remove them if you need to install expansion cards and put them back when you don't need the cards any more).

The Tesseract has red LED fans, the P400 features its own frontal RGB LED lighting.

The Tesseract has: 1×120mm red LED front, 1×120mm red LED aft, with the option to add 2×120mm fans to the top.
The P400 has: 1×120mm front, 1×120mm aft, with option to 3x120mm (2x140mm) front + 2x120/140mm top. The position of the fan headers on the GA-X150M-PRO ECC totally allow the 3x 120 front fans + 2x 140mm top with 2x Y-splitter cables (one for top fans, one for two of the front fans) for best cooling config.

Gigabyte GTX 1070 Windforce OC vs Palit GeForce GTX 1070 8GB JetStream: The Palit is equipped with RGB LED while the Gigabyte features higher GPU clock. Both will spin down their fans when under lighter load. All things considered, the actual performance differences will be just marginal. Similar to the CPU comparison, the case/chassis that can offer better cooling will let its card maintain higher clock-> better speed.

TL;DR : logain i7 build would be ~2-3% (+1-3 to minimum fps) faster in game while my Xeon E3 1230 build would be ~5-6% faster (could mean a minute or two, could mean a few tens of minutes; the bigger the task, the bigger the difference) in editing/rendering.