Meta Ads vs Google Ads, which one should a beginner actually start with and why?

I have ₹15,000/month to test paid ads for my local service business and I can't afford to split it. From what I understand, Google Ads targets high intent users who are actively searching but CPCs are expensive, while Meta Ads are cheaper but interruption based. So which one actually gives better ROI at this budget for a local service business? How long do you run it before you can tell if it's working or just burning money? And what's the biggest beginner mistake on each platform? Real numbers only it depends is not an answer.