What OpenCart template you like the most in functionality and features?

Honestly, most of the resources contain themes with the similar features. Let me show you these amazing opencart templates https://www.templatemonster.com/opencart-templates.php which you can easily use for your projects. I`ve been using this resource for a year already and should say it works pretty well for me and my clients. Good luck with it, guys Wink Hope I helped you here

No specific.
I believe one should go for the default and then make required changes accordingly as all templates look good ,but, once purchased no one bother to enable the default settings and images .

A lay man has to break his head for setting up things.

Thanks