Both are well known brands, coming from large companies, doing a lot of marketing, being easily available, all that does cost.
And especially Shun delivers relatively poor performance combined with great, flashy looks. The Tojiros are better value wise, but still, you may get much better.
In both cases, avoid VG-10 if you're not an experienced sharpener AND you're not sure to get the best Heat Treatment, made on small batches.
Have a look at Japanesechefsknife.com
and especially at the Fujiwara, Kagayaki (their home brand), Hiromoto, Misono (the Swedish carbon and 440 series).
Expect much better quality and value.
But first, how do sharpen?