Instead of putting ten client websites into one ordinary hosting account, each client can have their own cPanel account. That separation makes websites easier to organise, troubleshoot and eventually hand over if a client leaves.
Your customer relationship stays with you. The hosting provider operates the infrastructure underneath while you decide how hosting fits into the service you provide to clients.
WebFlag's rule of thumb
Start with the simplest product that comfortably does the job. You can always move up later.
If you are still unsure what fits, tell us what you are trying to run rather than trying to decode a list of server specifications yourself.