Best site to create a landing page from a template?

Hello! I need to use a service to create a first version of the landing page for a product we want to create/pitch. Since we're in a very early stage, we don't want to spend much resources on it. We just need it to help support our pitch and will probably have lots of changes.

I'm thinking on something along the lines of squarespace or wix. Any recommendations?

Thanks a lot!