Always use Welch's t-test instead of Student's t-test

Helpful post from Daniel Lakens with simulations and explanations.

Take home message of this post: We should use Welch’s t-test by default, instead of Student’s t-test, because Welch's t-test performs better than Student's t-test whenever sample sizes and variances are unequal between groups, and gives the same result when sample sizes and variances are equal.