creating custom form with content type list - Shaepoint 2013 list

I have a list with a content type. So basically i have the default content type and another custom one. I would like to customize the forms and taught of using sharepoint designer. Is this a good approach or is it better using infopath. When i try using infopath i don't know how i can using content type to create forms. I basically have 2 forms based on the content types how can i separate this when using custom forms and what would be the best practice?

Cheers and thanks in advance