Movin' on up

What is better; DVD player with built in upscaler or an outboard one (e.g. DVDO iScan), ASIDE from the fact that I can plug in the VCR's S-VHS output to the outboard one.
Can't rally make such a broad generalization - depends on the implementation. But, in general, as with most things, I'd think an external single purpose device would be more flexible and more single-mindedly suited to task, but probably more expensive.