Hello. My name is Gonzalo. i've been working in Online marketing since 2011. For the campaigns i run i charge a percentage of budget. i Think its better for booth.
For generate a solution for your project i need to know more about what you need. I'm an analytics an adwords certified by google. I've been running many campaigns for different customers like retails, education, websites, music and fashion.
if you want to generate branding display its a good option. If you need convertions Google Adwords search its very good.