Both from an animation and gameplay perspective, it’d be nice if soldiers gripped the pistol in both hands (so long as one hand isn’t disabled). A minor accuracy boost would be logical, and most police and militaries worldwide use two-handed shooting as their primary method.
Makes sense. This is how it was done in XCOM: Enemy Unknown, anyway. Soldiers equipped handguns two-handed in any case, because they were actual secondary weapons and not just a quick-draw ability-based shot like in XCOM 2.