how you choose which of the 40,000 or so denominations is the best.
Jesus is the best, and His apostles have given us the best. There is no best which is less

And God knows who are His. And He makes us able to tell the difference. His obedient and mature and exemplary people can be attending in some church which by its official practices does not obey God's standards for selecting qualified men to pastor. But a certain church might have a qualified person. And God can use such people to reach to others, using a denomination as a fishing hole to fish for men.
Paul says that he is not surprised at how there are divisions > 1 Corinthians 11:18-19 >
"For first of all, when you come together as a church, I hear that there are divisions among you, and in part I believe it. For there must also be factions among you, that those who are approved may be recognized among you." (1 Corinthians 11:18-19)
So, it looks like Paul knew how the real children of God had unapproved people in the midst of them. But he knew the sheep could smell the difference and know whom God approves.
Paul says that by having factions, "those who are approved may be recognized." The wrong ones made the right ones look good, I can see he means ! ! !
So, when you see wrong ones doing control things and other ungodly stuff, do not allow the wrong ones to decide if you stay with a certain group of people, but find who God's approved leaders are by example which feeds us to become more like Jesus (Galatians 4:19) and submissive to God in His peace (Colossians 3:15) and who helps us to relate "worthy of the calling with which you were called" > Ephesians 4:1-3, Ephesians 4:31-32.
I personally understand that we need to get to know someone personally so we can feed on his or her good example. But God is not limited

He is able to minister His grace through people we do not know in our practical lives on this earth.
The one up front in a church might be an immature person and one trying to rule by control. But in the back of the church there can be a mature senior who is God's approved example, who feeds the flock by feeding us his or her good example. So, we need to not let evil and hypocritical people decide how we see any group, and where we go. Also, Jesus expects us to love and have hope for wrong people; we can reach them with our good example, like how our good examples reach and minister God's own grace to us > 1 Peter 4:9-10 < like our examples, we all can minister God's own grace.
God's grace is what is the best and most accurate, to make us like the real Jesus, and His grace in us has us doing all He knows His word means to Him > Isaiah 55:11 < no matter how this world makes it seem we can't get God's word right, Isaiah 55:11 unconditionally guarantees how God's word "shall accomplish" and "prosper in" all which God pleases.
Whoever are His people will help us with this.