Hey Erik! Welcome!
I love this question, because it’s easily overlooked but can have a huge impact on conversions. Whatever you decide on, I’d definitely run A/B tests to see what’s more effective for your campaign.
I’m not sure if there’s a “right” answer to this, since it’s a slightly controversial topic. What I do know is that Unbounce is a big fan of the orange CTA button, or as it’s lovingly referred to as the BOB (big orange button).
Unbounce legend @oligardner wrote a blog about CTA buttons, and though it’s from 2009 it’s stood the test of time. He wrote “According to Wikipedia, Orange represents energy, enthusiasm, and a ‘get-it-done’ attitude. Sounds like a call to action to me. Get it done. Click.”
However, some argue green is associated with positive emotions (green means go), and red is associated with more negative emotions (red means stop), but then some say that red is more attention grabbing.
I like @Stefano’s suggestion as it negates that entire argument, it’s also a really clean design that works with many different brand guidelines.
Your CTA button may also depend on how the rest of your landing page is looking - do you need to heed any brand guideline restrictions, or is this free for some creative exploration?
Regardless, I’d love to see what you end up going with and how your conversions turn out, be sure to keep us in the loop!