Under-construction projects are giving me major anxiety.

I work in real estate, so I know what builders don't tell you. Still, buying for myself is way different. I'm looking at a 2BHK in Noida Extension, ACE Group has a project there. The price looks good, but it's under construction. Honestly not sure if it's worth the risk, even with RERA. I've heard horror stories about possession delays. Has anyone else faced this? I'm also wondering if the advertised rental yields are even real. It's tempting to buy now, but maybe ready-to-move is safer. Am I the only one freaking out about this? Should I just stick to ready-to-move? Need opinions!