i would say use the R, definately, its not silent so use it! lol but then again its kinda like the whole po-tay-o, po-tat-o thing, or to-may-to- to-mat-o thing, or soda vs pop, or car-mel car-a-mel, or ket-chup cat-sup, or... well you get the point, it depends on where you live, different people pronounce things differently but personally i would use the R, but thats just me...