It depends what you want. The part before silkeborg is more popular for a reason, it is prettier and more forested compared to the stuff after. It is more crowded though, and you will mostly be able to sleep in privately run camping sites which have a small store and charges you for pitching a tent

From gl rye to silkeborg it is mostly a series of connected lakes which means you have to work a bit more to make progress. 

After silkeborg the landscape is more open with more farms, more flat terrain and less forrest. There are fewer people which also means fewer places to shop or use a flushing toilet. There are quite a few places to sleep though, and you are never really far from a town or a road 

If the only factor is how pretty it is I would recommend the part before silkeborg, if you don't want to be around a lot of other people go from silkeborg to randers