HTML vs Plain Text Emails

These days both HTML and Plain Text emails have similar levels of deliverability, but with HTML emails there are the following concerns:

• If HTML has errors and results in formatting issues and user can't read email properly, user may mark it as spam
• If HTML email contains too much pictures and too little text there is a higher chance of spam filter marking is as spam

References:

• http://www.aweber.com/blog/email-marketing/plain-text-vs-html-email-2014.htm
• http://www.aweber.com/blog/email-template-design/should-i-use-text-or-html.htm