The objective answer, if the goal is better NCAA Tournament seeding, is a blowout.
NET Ranking currently values winning margin up to 10 points and net efficiency.
Psychologically, for the players & coaches, you could argue that close wins are better experience for the team's growth.
For my gastrointestinal health I'll stick with the blowouts please.
Last night's game will be memorable but not to the same level as other noteworthy games that have been mentioned. We had some good performances, and the team probably played its best game of the year so far. But the competition level was lacking.