I've seen too many straps with the velcro on the outside, where the velcro wears and the end of the strap doesn't really stay attached, gets caught on something and pops the buckle open
If you look at the photo I posted above, there is a slider that goes over the velcro to lock it down. I moved it all the way forward so that I could pull the velcro back for the photo. There's no way the velcro can come loose with the slider over it.