Landing Page - Constructor or Self-written option?

Question

Landing pages

Hello everyone, the goal is to sell LPs, for each product there are several different LP options, to run tests.
How best to do in the ratio of time / quality / money? I would like a minimum of time for creation, and more to devote to setting up the RK.
Choose paid designers or write yourself? The second option will kill time, and the first money. Who does what?
The question with the built-in CMS system is also interesting, let's say it is in paid designers, but if you write it yourself, which one to fasten?
Can you recommend good wysiwyg editors as well?