Camera mounted slide copier vs flat bed scanner

Want to digitize the family slide collection. Generally the exercise is
to archive a family pictoral history, but there may be occasional shots
which I would want to convert into high quality prints. Not confident
as to which type of equipment best meets my needs, recovered image
quality and price being major considerations. Speed of performance is
not a primary consideration. Cannot get a handle on the relative
equipment performance capabilities.

Looking at Photosolve hardware to attach to my Canon A75 digital camera
(3MP) for copying 35mm slides. Alternatively, considering Epson 4990
flat bed scanner.

Would the image recovered using the camera mounted equipment be
better/same/worse than the image which would be recovered when using
the new Epson 4990 flat bed scaner.

Does anyone have working experience with both of the above pieces of
equipment and could provide some perspective.

 

Per tr:

I'm in the home stretch of doing the same thing.

Tried the camera-mount thing and was not satisfied with the quality. Too much
posterizing, for one.

Wound up buying a Nikon CoolScan 4000 and doing them that way.

People have said that a 4000 dpi flatbed can accomplish the same thing - but I
did not explore that avenue. Also, I've got to wonder about focusing issues.
With the dedicated film scanner, it gets a chance to focus on each slide - OTOH
a flatbed is looking at many slides and probably doesn't even have a focus
capability.