Xpel is the Ferrari of films, it's got unrivalled clarity, next to no texture, very resilient to damage and scratches backed by a 10 year warranty. They're an american brand and are the only manufacturer to make the film in the way they do and each machine to do it is 10 million.
Premiumshield is cheaper theres no doubt about it, I've got nothing bad to say about it but just note that Xpel are particular about who they will allow to be certified, I've seen a lot of one man band have a go heroes use premiumshield who order a kit from them and get it posted. We cut all our xpel kits in house on a £10,000 plotter, if we mess a panel up we cut another kit until it's right.