My two cents having gone through this process recently:
Potential investors, existing investors, and prospects with whom we've PoC'd came back and said: your value prop isn't clear, website too flashy and barebones, only giving you a second look becuase the founders are a strong technical team with credentials.
In my view, a well-designed landing page that explains what you do, what problem you solve, who you solve it for, and how well you solve it is all investors are looking for at this point.
It's almost funny to discuss branding at a point where there isn't even an in-production product with actual users who have an attachment to it which they can provide feedback on.
I spent years in agencies selling such services. It's usually all hype. Don't believe me? check out base44. Almost 0 branding, generic website, on track to 20m ARR solo founder.
But the website is clear, works well, identifies its target audience