Caxton FX is consistently 2% below base rate for the Euro card and 2.75% below the respective base rate for their Global card.
Personally I prefer the relative security that the Halifax Clarity Card brings, since its not actually 'your money' that you're spending until you pay the bill at the end of the month. You've not got to load it up either.
I did a write up after our 12 month European / Moroccan trip here:
[url=http://www.europebycamper.com/2012/06/halifax-clarity-vs-caxton-we-saved-over.html]Halifax Clarity vs Caxton - We Saved Over
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