and i'm still check and get some information all of them,and the best maybe can used by me,and glad to be know that there was 3 debit card that i know.
Well i know the differences between them, firstly xapo has their debit card which when you spend your bitcoin it takes that moment conversation rate, with e-coin you should first convert bitcoin to fiat money at their website and then spend, and about coinbase i have not much information as it is a new product nowadays.
E-coin: so called PrePaid card which you top up from your BTC account. After the top up you can use it as a regural bank card. (But in this case you can exchane the same amount to fiat and use your existing fiat bank card. Why to have 2 cards for the same purpose?)
how exactly do you easily and instantly exhcange BTC to fiat and us on your existing fiat bank card?