Radial has greater strength in a vertical force capacity. For polo the emphasis is on horizontal impacts not vertical. In this case the more crossed and amount of spokes the better and, 3 cross or even 4 cross will help as it gives a stronger horizontal rigidity, less likely to buckle from side impacts. 48 spoke on a 700c wheel should be good...just keep the spokes tensioned! At the end of the day the best thing to ride would be 20 inch 48 spoke wheel on deep rims with a fat tyre!
Radial has greater strength in a vertical force capacity. For polo the emphasis is on horizontal impacts not vertical. In this case the more crossed and amount of spokes the better and, 3 cross or even 4 cross will help as it gives a stronger horizontal rigidity, less likely to buckle from side impacts. 48 spoke on a 700c wheel should be good...just keep the spokes tensioned! At the end of the day the best thing to ride would be 20 inch 48 spoke wheel on deep rims with a fat tyre!