If you're attempting to use Zyte Smart Proxy Manager(formerly Crawlera) to avoid getting blocked, the website will still be able to track you (with the user details you used to log in) and Smart Proxy Manager won't help much.
Using Smart Proxy Manager to avoid region restrictions (ie. crawl from specific locations/countries) is a valid use case. If this is your case, you should use Smart Proxy Manager sessions.
It is important to be aware that scraping past the login of a site could raise legal concerns. Our Terms of Service state that you may not use our services to access, connect to, or retrieve data from sites that are subject to terms of service that prohibit scraping. When logging in to a site, you may be required to accept terms that prohibit scraping or put other limitations on your use. It is your responsibility to review those terms and make sure you are abiding by any applicable laws and Zyte’s Terms of Service. If you have any questions about this, our compliance team is always available to help and provide guidance