Amazon is showing 2 and 4 port USB European chargers. I'm also looking for a 2 or 4 USB charger for trips the UK but the European one takes precedence.

Any recommendations? Some reviews of 4 port chargers warn that iphones, androids and tablets will charge much more slowly than a 2 port. Is this true from your experience?

Between my husband and me, we'll need 4 USB ports. What products do you trust? Thanks.