It depends on your company's requirement, size of database, number of transactions, number of access, type of applications. Without this information, nobody could be able to suggest which server hardware is good and which is bad.
Thanx for the reply. My interest is to know how many have adopted these server class hardwares. M series were one point the prefered server class for the DBS. Now that oracle is touting on T4s, my interest is to know how many had jumped on to that band wagon.