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Interview them. Remember that realtors work FOR YOU so you should interview several of them and then make a decision. For example just because Sue likes her realtor Randy and he's reputable and trustworthy does not mean that you'll like Randy. We all have different personalities, quirks, communication skills etc, and sometimes what works for others won't work for you. There are about 10 extremely reputable realtors that always come in at the top 1% of my real estate board, but I have many friends who have interviewed them and didn't like them. In the end they chose realtors that aren't even top 10%. Interview them and get a feel for them. See if you like their personality, see if you feel like you can trust them, can you imagine working with them for months at a time, do you think they'd be quick in responding to emails, phone calls, etc, are they pushy or laid back, etc. These things matter and not everyone wants the same type of realtor. So look around and pick one that fits your personality and needs.
Good luck on the house hunt.