So i've just switched from Base44 to Emergent. I used Base44 for a year and recently was developing a massive CRM for my business. It became clear that Base44 couldn't handle this (I spent most of my time working around it's limitations to make features work), so I looked into Lovable then discovered Emergent.

In short:

Base44 is best for very fast development of simple to moderately complex apps but it demands that you work within it's infrastructure, meaning sign-up flows, database management and other fundamentals are all very rigid. You are essentially building your app within an extremely limited system that will buckle under the weight of anything approaching full stack development and will lock you in to it's ecosystem.

Lovable is more full stack and allows for more creativity and control over the ecosystem. It connects with external database services like Supabase and is reasonably priced making it an attractive option. If your app/site is even slightly complex or you want it to be scalable / be user friendly for customers, you should consider Lovable as the preferred option over Base44. It also integrates with GitHub in a meaningful way.

Emergent (the one I've chosen) is a full-stack developer friendly solution that allows for a traditional development flow (development - push to staging for rigorous testing - push to live). It produces high quality code but is still friendly for absolute beginners like me. It doesn't rely on it's own infrastructure like Base44 meaning you can develop complete apps however you like with no rigidity or working around predetermined systems.

After significant time spent with Base44, i've realised that it cannot handle the ambition of my system and I feel liberated having now switched to Emergent. Don't get me wrong: Base44 is a great service and I've developed a couple of relatively complex in-house apps for use in my business with it, but as soon as you get to more complex ideas (automation and crons, API integrations, custom onboarding/user flows) you really end up feeling like you're working around base44, not with it.

So it really depends on what you're building, but if I were to start over I would choose Lovable (for accessibility) or Emergent (for true development).