@Amal Bhatnagar, I think you are wise to seek out professional management. Yes, it costs money.
But the residential property management industry is a multi-billion dollar industry, not because as @Charles Carillo puts it "they are just calling their own handyman" but because there is incredible value to be added when you hire a good PM.
-PM Leasing - should not be done by a "realtor on the ground." They will have no idea what they are doing, what they are looking for, or likely the laws surrounding credit reporting.
-PM Marketing - should be good enough to reduce days on market significantly.
-PM Turnover processes - again, designed around reducing days on market and limiting landlord exposure/liability.
-PM -The lease itself - you're unlikely to have a bomb-proof lease if you buy it online. PMs know what needs to be in the lease, and that constantly changes with legislation.
-PM -Cashflow - people hire PMs specifically to INCREASE cash flow, not to decrease it. It's not a luxury, any more than hiring and paying a CPA or an Attorney are luxuries. Good PM makes you more money than you could on your own.
But to your question - I would check Google Reviews as a good starting point. Check out all of them for a company and try to see if a pattern emerges. Are they consistently accused of being unresponsive? Are they consistently praised for renting properties quickly? Do they respond to their reviews? The company culture matters, that's a big part of what you're hiring.