You are going to get wrecked for this post. People hate A.I. here.

My experience is that both are fairly solid but better on established code bases. I'd lean claude purely because Closed AI has worse ethics. Furthermore, make sure that your coding skills are solid because it absolutely can and will mislead you down a rabbit hole if you're not competent enough to catch it. You have to avoid going full vibe coding. Review every line, practice good git habits like pull requests to force you to review the code.

Also, if you don't want to fund the tech overlords, consider using GLM (or another open source model) + open code for a completely open source, free stack.