I would like to know whether the infographics creation, sharing or submission techniques are still worth for SEO?

yep, still there is a huge value for info graphics submission

If the infographic matches site content and intent and is device friendly: graphic content is easily interpreted, language independant; Huge value.
If the infographic is irrelevant, SEsuicide

can we know best infographic site for sharing.

Infographics hold great value for SEO.They should be used equally as videos, in my opinion.

This is a very attractive way to get a nice value in SEO. You can check this link to get many worthwhile infographics sites to deliver yours.