The better advantage, IMO, is that you accept abounding admission to a committed server and are the alone chump on the server. Any time you are on a aggregate server, whether reseller or not, your armpit can be afflicted by your "neighbors." We confused to an unmanaged committed because it provided added reliable email account which was the capital affair we had on aggregate servers with a brace of companies. As to whether you "need" your own server, it would depend on your sites. There are association with lots of domains but little cartage that run accomplished on aggregate servers. Sometimes, though, a armpit outgrows aggregate hosting and needs the assets of a dedicated.