Wallie card or UKASH Card?

[Jssy]

Which is better? I was gonna buy one tonight for credits but I'm unsure which to get :S

[Mark]

I've used UKASH before, it's a good and easy to use system

[AgnesIO]

Whichever is the best deal

Most the cards are the same just with different names

[Pigperson]

Just a few questions:

Which one gives the best deal?
How easy are they to use?
How available are they both in the UK?

Will