Ok, got it. I have misunderstood you.By saying overnight delivery as safer compared to others, I mean to say less the package in transit time, much safer it is. Also, overnight packages are separately handled and prioritized, so they have the least chances of getting lost in transit. This does not imply that all other options are unsafe. You can try any of the available options you see feasible based on the reviews. You can also check 3rd party shipping websites (eg: https://secureship.ca) which provide UPS, Fedex or DHL shipping labels at a discounted rate.
I was thinking of making a courier shipment through secureship.ca or a similar company. I thought you meant these were unsafe, too. Even though, in fact, they also ship with UPS/FedEx. Thanks.