If you're looking for an easy way to build Web pages yourself then either Unbounce or Instapage look fine. Of course, I would urge you to do A/B testing to determine which messages and layout get your best response.
If you want more control over your site I recommend you use WordPress and the Divi theme (https://www.elegantthemes.com/gallery/divi/). Divi cost me $79 and I built http://STARLINGwatch.com and http://EndOfTesting.com. It's responsive so it looks great on laptop, tablet, and smartphones.