Hard vs soft Aikido

I have been trying to compare the different styles of doing Aikido for years. Both styles can be very power full. The hard style which is a rougher form is more based upon techniques. The techniques are done very hard. There is little bending if any with the uke. I think it's a robot style. The soft style which is done with ki is more based upon bending with the uke. It can be very power full but much more grace full.