Which SAP CRM solution to be suggested to a Client?

Hi Experts,

I am bit confused on which CRM tool to suggest to a client? Currently from SAP itself we have almost four different solutions.

1. SAP CRM -Net weaver [usually on premise]

2. S/4 SAP CRM - will be launched shortly - On premise and On cloud

3. C4C - Only on Cloud

4. Hybris - On premise & On cloud

Which among them is going to fulfil all the requirements of a business / client?

Rgds

Hari