Google Adwords Smart Lists
Re: Google Adwords Smart Lists
Thanks for posting to the Community! Either the smart list in Google Analytics or a list you create after placing the AdWords remarketing code will work the same, as long as you have the code on all pages of your website and you have the length of time you keep a user on the list the same (the default is typically 30 days). It's more a questions of which is more convenient for you to implement.
In either case, I'd recommend using that list in its own separate Display Only campaign so that you can control how much you want to spend on it each day, as well as the messaging you show repeat visitors.
Let me know if you have any other questions,