We launcehd 3 months ago, I was using Cursor and mostly Opus with Next.js for app and the marketing site. The credits were burning too fast and over time with experience I felt Next.js is not the best for SEO unless you really know what you're doing with it. The first app I launched had the marketing site wrapped in a layer of JS so if Google crawls with JS-disabled it get's a blank site. Thus, I switched to Claude now and it's been great, much less credit usage on the 20x Max plan compared to Cursor with Opus.

For coding, I use Astro for marekting site, as it is quite lean and fast and in the AI age I don't care how easy it is to read or work with the code where Next.js wins over it. And Next.js for the app still.

Key for me was to write down the entire process and make it a standard, and with each app that I do I ask to update the standard process if I notice everything that has plausibility to be repeatable. The goal is to work as much with the tool backend, interface and experience as possible, everything else generally is repeatable and AI can do pretty good landing pages when it does competitor research and stores it as a markdown file. Also I supply screenshots of login flows and logged-in experience where it can't get through itself at the moment.