As you already know this now that it is possible to create Shared Hosting Plans on Dedicated Servers, better to opt for Linux Dedicated Server with cPanel/WHM. This would allow you to create Shared Plans with cPanel access to each client. Each will have access to only his/her allocated resources.
Considering High End Dedicated Server provides you best performance and high reliability. You may check the best suitable plan using the below link:-
Dedicated Server Hosting