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Both are modern range releases and unfortunately there is sometimes duplication.
One such duplication occurs with the 1:76 scale "Green Goddess".
Which is best? Both have good points and both have bad points.
In the end, choice could just be narrowed down to livery options.
Pictured below are two light liveried examples of each ...
The desert sand is the Corgi Trackside, The hi-viz yellow is the Oxford Diecast.
Spot the casting and detail differences.

The origins of Oxford Diecast started in a corner of the factory at Corgi and when Oxford were established the staff were made up of ex-corgi workers. Great evidence above of the two companies now completely seperated.

Ghosthunter.

I'm finding that the Oxford Diecast front end is poor but on the other hand, the side window profile of the Corgi Trackside is rather squashed.

Chalk and cheese here....The Oxford grill is suspect so that do's it for me.....

All thinks considered, the Corgi looks the most accurate.
Seems that Oxford moulded in a shadow or a rear strut brought forward on the grille.
The side quarter lights are also too wide and the windscreens too deep (although the red one below does have the deeper windscreens).