Customer service through "e mail" or "telephone", which one would you pick for that extra care ?

Though email and telephone Customer Service has the same weight when it comes to providing information, I would still prefer telephone Customer Service because it is more personalized and sincere than emails.
Hearing the polite and friendly voice of a telephone operator can help keep loyal customers for a long time which eventually leads to 100% repeat transactions in the future.

2

I see the points for the telephone but I would pick 'email' for that extra care because:1.
Less intrusive - telephone calls can disturb customers, they may be in meetings etc and unable talk and have to cut the call short or not give the call their undivided attention.2.
Access - Customers can read email at any time and are more likely to give a response, even if only a simple 'Thank you.'3.
The email is there, they have your name and contact details and can easily contact you when ready.
With a call, they details could be easily forgotten.4.
An email can have name and details of the company, thereby keeping the company's name in the customer's mind.

I prefer the first choice for the second

Both of them i can handle whilst i'd prefer handling emails 

je commence pour la premiére

Mon choix s'intitile sur le plus profond en terme de jusitification et qui permet de bien transmettre le message tel qu'il est " e-mail".