Online Access / Paymend modalities
The corner cards give you online access to your account which might be useful.
Credit Suisse issuing the normal Swiss M&M Cards and the Coop Cards are not offering this.
Re Coop Card: Be careful. It seems the send you a bill in the middle of the the month and you have a very short time period to pay for it. AND: - it is not possible ot have it debited to a bank account automatically. (At least it used to be like this). This is done on purpose and not a technical issue. That why they try to extort some money from you. (Fees for reminding you plus interests)
To put it in short: if you travel a lot: Cornercard is your best bet.
All other cards charge to much commission outside Switzerland and the Coop Card is only useful is you are really not travelling