Should I separate current users and potential customers?

My company is a B2B Software as a Service. We have a web with 2 main functions:

  1. Log in for my current users (hundred of thousands)
  2. a marketing web for my potential new customers, (portfolio, blog, contact us, etc.), about hundred leads.

It is recommended to put a first landing page to asking if who is in the browser is a current user or a lead, and depending on it, redirect to different webs?

I think it can improve the web optimization for each audience, and help keeping separated metrics (Analytics), but can be hard for who is browsing to give an additional click for accessing the page.