None of the big names are perfect but, if you can, always go for a courier that have proper vans and drivers in uniform. As soon as some unshaven joker turns up in a beaten up, random red van, or in an estate car with family onboard, on a sunday pm, the chance of your package going missing goes sky high. The big names like DHL, TNT and UPS are generally more expensive, but the warehouse operations are way more secure and drivers are accountable for what they move.
Hermes should be avoided at all costs. Complaints never go anywhere, drivers are not reprimanded and, much like certain companies and warehouses that existed at heathrow, Hermes attracts lot of dodgy people due to the way it is run.