Hi, Both versions are OK, and no worse than a lot of such phrases.
However, the comparative version ( 'Smarter Thinking . . . ) makes me wonder 'nmarter than what?' eg smarter than the competitiiom? eg smarter than our thinking last month?
As a general rule,tag lines are most effective the shorter they are. In this case "smart", being the shorter word, is the punchier. Be aware however, that your competitors are now left with the beautiful opportunity of using the other example!