No personal experience, but if you decide to use either, please let me know how it turns out. I've got a couple of spots on my C series that could use a touch up courtesy of the gritting on the M25 last season...
I can't speak to those specific brands but I found Dr. Colorchip to be very good. I've used it on a Miata and an SLK and the paint match was perfect in both cases. Dr. Colorchip is great for small chips, but doesn't really fill the big ones (larger than 1/8") perfectly, although it does mask them reasonably well. Small chips disappear and are almost impossible to see at more than 1 foot away. It looks like they will ship to EU/UK.
I have used a bloke In Leicestershire called Dire Scrapes. He was brilliant. Did my wife gold Astra and I couldnt see where he had been. Mixes the paint in his van on site. Had two nasty scratches but totally gone after he had finished
7, Hawthorne Drive
Blaby, Leicester (Leicestershire)