This has been hashed out here a lot over the last 10 to 12 years. A lot depends on where you are based and where your travels take you, imho!
I had a fixed pitch on my 6A and the first time I flew to Denver from my home base in Texas I was convinced to change to constant speed.
Upon departing KBJC on a warm afternoon, full fuel, and near our gross weight, I had a hard time out climbing a Cessna doing touch and go's on the parallel runway. Granted, he also had two on board but probably wasn't loaded heavy for a training flight.
Got home, converted over to constant speed, and have never regretted it.
On our next trip to Denver, same scenario. Near gross, full fuel, heat of the day only this time it was a Mooney on the parallel for departure. I left that Mooney behind, probably wishing he had an RV.
Actual performance difference between the two props was around 1200fpm in a high density altitude situation.
So you be your own judge in deciding how much "total performance" you need!