Upgrade SAP CRM 7.0 EHP2 to EHP 3 or EHP 4

Dear Team,

We are currently using sap crm 7.0 Ehp 2, we would like to upgrade crm system to EHP3 or EHP4.

So we need suggestion, does we direct upgrade to Ehp4 or will go for EHP3.

Could you please suggest us? Also let us know pros and cons of EHP4.

Thanks in advance

Thanks,

Vikas