My 2 cents, choose retool. I have no association with retool but as a product/business owner question is do you want to risk with a startup or an established product that reasonably solves your problem. Retool is pretty reasonable pricing wise, very stable, great support and inherently you dont have to deal with startup like bugs.
Retool is a great product, but I don't think your reasoning is entirely sound.
> do you want to risk with a startup or an established product that reasonably solves your problem
I think it depends greatly and I don't think this is a hard-and-fast rule. If you're adopting a product that is easy to replace and doesn't have huge vendor lock-in, and the startup offering solves your problem better than the established vendor, then a startup might be a better choice. Windmill is an open source product, so even if they went out of business, you'd still have access to the code which is a great way to avoid some amount of the risk surface area.
You've posted four comments now in someone else's launch thread. One was arguably maybe ok (though also arguably kind of rude). But you're going overboard now, so please stop.
Whether it's YC-funded or not, each startup deserves to be the focus of its own launch thread. There will be plenty of other opportunities for you to make a case for your own startup.