Should i use field.tpl.php or Display suite to add my own classes to fields? I want to get rid of the default classes and add my own to the fields. I was always using field.tpl.php but i've read some tutorials where people are doing this with Display Suite. So should i do this via field.tpl.php or Display suite?
It's matter of opinion, really. I'm using DS and it works fine, but it might have disadvantages later on, because I will have to export my settings to code with Features.

Also, DS isn't your only option - you can also try:


https://www.drupal.org/project/semantic_fields
https://www.drupal.org/project/field_formatter_class


and others. Which depends on your other needs - for example, are you planning to use DS multiple display modes handling?