With new technology, I'll have a pair of team members spend some time doing exploratory work. Spend some time with the top 2-3 technologies and see which is the best fit.
Taking notes through this process is important. If we're comparing databases, include benchmarks and tooling observations. For small organizations, this is usually a multi-day process. For large organizations, maybe up to a month. But at the end, the team can make a decision based on at least some experience and information.
If, on the other hand, we have competing factions that each has experience with a specific bit of kit, but can not come to an agreement: we roll for initiative.
Literally.
I have a set of dice in my backpack for this exact situation.
Often, the worst decision is no decision at all, and I would rather that the team go down the wrong road for a month (and learn from the process) then spend that month arguing over what color to paint the hangar de vélos.
I think if we had a difficult decision to make and someone wanted to roll dice, it would feel pretty frustrating, like giving up. A more motivating process would involve giving someone responsibility, empowering them to succeed, and just letting them make the call.
Solves nearly all decisions.