From what I've learned from talking to @Vetani about Socionics is that Alphas/Deltas have a more agreeable presentation while Betas/Gammas have a more take-it-or-leave-it presentation. On the flip side, Alphas/Betas will be more upfront about it while Deltas/Gammas will be more low-key about it. Something along the lines of: Alphas = outwardly amiable, Betas = outwardly intense, Deltas = quietly amiable, and Gammas = quietly intense. For example that's why an SLI, while still being objective, may not be as emotionally striking as an LSI because of the softer presentation. I could have worded this a lot better but I don't know how else to put it.