i'm not 100% sure in this case, but i believe some coilovers are only offered in pillowball mounting, but i think of it as a plus as it gives you a larger range of motion and relieves some stress off of the key areas, as well as offers you more adjustability in some applications.

 

I got the pillowballs because they come with the adjustable camber plates for the front so that i do not have to buy the camber kits. and also they are a lot less harsh on the oem uppers