It is quite surprising at how fast the rate of price drops as far as computer peripherals today occur. Some months back, internal DVD writers cost somewhere in the vicinity of $50 to get. Now they cost practically half the price and by all means they are brand new.
There are also external DVD writers that are getting much rant today and they cost around $75 in the store. Between an internal and external DVD writer, unless you need it for mobile plugging purposes, it would be best to get the internal DVD writer if you will just use it for burning on your PC.
There are others who want external DVD writers so that they can plug it on multiple PCs or perhaps their laptop. There is really no configuration needed as they are USB based and plug-and-play. Rather than getting each PC their own DVD writer, sharing one is not only economical but convenient as well since you can remove it and just plug it in only when needed.
The cost is variant. Internal writers are stocked on one workstation only and unless you hate opening up your CPU, internal DVD writers only take a one time installation. There are no drivers required as well as Windows often recognized these optical drives instantly once booted up.
So between the two DVD writers, it all boils down to purpose and budget. Besides, if an internal DVD writer could go as low as 50% of its original price, imagine after some months how much an external DVD writer would cost?