The advantages of cross draw carry are easy access to the handgun while seated, such as while driving long distances as truckers and body guards often do, or for anyone else that sits at a desk. It's also good for wheelchair-bound folks. Cross draw carry is also an option for a second or backup gun.
Are cross draw holsters bad?
While there is some truth to that, in hindsight, cross-draw holsters are no more of a problem — and maybe less of one — when it comes to weapons retention than wearing a strong-side holster.
Why cross draw is bad?
Here are the downsides of carrying crossdraw: Poor weapon retention from the front. Positioning the weapon's grip in an ideal orientation for an attacker to grab it makes it an easy target for a gun grab. Makes it easy for the criminal to “foul” your draw in close quarters.