What are the best category urls in an online store - hierarchical or regular?

Question

Online shopping

For clients, promoters highly recommend hierarchical URLs for the store, for example:
le-go.ru/lego_2016_goda_lego_2016/lego_super_geroi...
that is, the site / subcategory / category
We are supporters of flat URLs, for example:
mini3.ru/catalog/vanni
, that is, the site / category /
What is your experience, tell me what happened to you. We ourselves are against hierarchical ones because the urls are long and it is difficult to change the structure of the store, but the promoters really want just such ones, they say it’s easier for them to promote.

Answer 1

Well, I do not always agree with such promoters. In the first example, it is obvious that the url is too long, it would be more correct here le-go.ru/marvel_super_heroes/2016. The main argument expressed by SEO specialists who consider hierarchical URLs more convenient for promotion is the presence of a navigation chain in the Yandex search results, and it seems that Yandex recommends that. In fact, as you pointed out, there are problems with changing the structure and duplicate pages are growing. It also depends on the specific assortment and page type - I would recommend putting irrelevant (flat, as you write) URLs on products, because often a product can belong to 2 or more categories at the same time. The URL structure should be primarily logical and understandable