My last 4 orders with wiggle have all arrived the next day by courier and as I was out, were left with neighbours per the delivery notes.
My last 5+ orders with CRC have taken anything up to 10 days to be delivered by Royal Mail. A couple of them had "while you were out" cards posted through the letterbox of a neighbour who was away on holiday, one was taken back to the sorting office and so far, hasn't been found, and one was rammed through the letter box so hard that the protective packaging cracked.
As a customer, I would have to say that in future I'm much more likely to use Wiggle than CRC purely on the basis that CRC's delivery partner consistently let them down.