Trust. What you're really talking about is trust.
If you're not coding 100% of the time on important value add tasks, you're not ever going to be as technical or as current on the details as your team. As a manager being the technical lead IS NOT YOUR JOB. You have people for that. Empower them, listen to them, arbitrate between them, enable them to get their job done.
It is not your job to decide what technology is best, your team is the one with that know how and will offer you choices and tradeoffs; if you need to decide you'll need to trust their information to choose the best set of tradeoffs for the business strategey. Trust them to give you the right data. Nurture the team so they don't lie to you; if they're lying to you, there are much bigger problems to solve than the technical details.