Founders, what would you choose? DIY launch video OR Launch Agency. (I will not promote)

I am working on a B2B SaaS and working on doing my launch video. I've seen many founders doing it themselves, and a lot more working with launch agencies which do hit millions in views. But, I want to know that those who did it themselves, how did it work out for you? Views (should we even consider it? Subs and signups are what I will consider as success). And how much you ended up spending on it? Those who worked with agencies, how much it cost to you? How many subs/signups you got? Was it a success or do you find yourself thinking you should do it on your own? If that's the case, why don't you do it on your own? Bandwidth issue? lens phobia? What would you suggest to someone trying to pick between these two.