on a vps you will get WHM as it is basically the same principal as a full dedicated server except without the full power of a dedicated. Management will be up to you, security, the whole 9 yards
a reseller account you will not be able to sell reseller accounts unless the host has one of those silly reseller selling reseller programs installed, which is one limitation. On the other hand it is a nice way of getting your feet wet and learning the ropes without worrying about the hassles of securing a server and dealing with the hardware/configuration aspect of the business quite yet.
Focus on your core business and then later expand on to a dedicated. Personally I would start with a reseller if you are just getting started unless you have a good base level knowledge of linux/windows and security. If that is the case then start with vps/dedicated right away!