If you are starting from zero and do not yet speak the language of devices, operating systems, troubleshooting, accounts, and common support issues, A+ is usually the safer first move. It gives you the broadest base for later cloud, networking, or security work.
If you already work around Microsoft, cloud, or business systems and you know your next move is Azure, AZ-900 can be a cleaner start than forcing yourself through a general IT path that does not match the job you are targeting.
If you are already in a Microsoft 365 admin environment and Copilot is becoming part of your day job, AB-900 might be a better first AI-adjacent choice than a cloud-AI cert. If your real work is business productivity, the AI chooser will usually push you toward AB-730 or AB-731 instead.