Good luck with this. My impression (I am NOT an expert) is that you are in a middle ground. I've had a Wise 2086 for 10 years and it's been reliable. I've had minimal need for customer service but remember them being helpful. I have not heard of any problems with the Neos.
To my mind, that combination represents great proven value.
Another consideration is that you have a built in backup tension head (should power be unavailable or the Wise have to be shipped back for repair).
The Neos/Wise combination strikes me as the easier sell on the used market as well. (even many years later)
The Gamma seems very well thought out. I have a friend who has been using a Gamma for the past 10 years without any issues with the tensioning head.
that's my $.02 !
half way to infinity