Radial circuit; 4mm cable & a protective device of 30/32amp will serve a max floor area of 75m sq
Radial circuit; 2.5mm cable & a protective device of 20amp will serve a floor area of 50m sq
Ring main; 2.5mm cable & a protective device 0f 30/32amp will serve a floor area of 100m sq.
All the above can have unlimited outlets & fused spurs, you can have as many unfused spurs as there are outlets.
So basically it's down to area coverage & cost of 2.5mm cable against 4mm cable.
Radials are easier to wire (ignoring 4mm over 2.5mm) as no need to get the cable back through to the CU to make a ring; the run length of cable for a radial circuits is also limited to circa 30m.
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