If both flights are on the same booking, United will take care of you if you miss your connecting flight.
You'll have to wait an additional 3 hours if you book the later flight, so you're probably better booking the earlier flight and if your inbound flight is late, let United sort it out for you and book you on the later flight or onto another carrier.
The legal minimum connection time on a UA to UA transfer on the same ticket is 70 minutes.
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