Hard choice. I've been using command control since 1979 with the original CTC-16, club moved up to PNP-112, then on to RailCommand. Very expensive proposition with every change especially since at the time decoders cost between $80 and $100 (not adjusted for inflation). So I was elated in 1993 when a standard (DCC) was proposed. It was almost immediate I noticed the drop in prices. Our club went with Lenz because of the availability of the CVP wireless system for it. In the club, with wires they always ended up in a tangled mess as one tried to follow the train around the layout. Wireless was an amazing difference.
In the mean time, for home I purchased the MRC Command-2000. Compared to the Lenz system it seemed stone age, but got the job done. I liked having all three throttles on a single box, and all the locos I converted would run at the club too. I later purchased a 2nd one, because the price point was amazing.
Then when the club was making a second purchase, the Lenz company offered club members steep discounts so I was able to afford a top of the line Lenz. It became my primary system, and likewise I saved so much in the purchase of the system I was able to also purchased the CVP wireless for it.
Then I started at the museum where they had chosen the NCE system. I got used to the big heavy throttles. Then just happen to come across a Pro-Cab R on ebay for dirt cheap and picked up.
Later I made a layout for my father to have in the assisted living center and got him and NCE twin for it. There were only 2 locos so it was perfect. After he passed, I of course got the twin back.
And then somewhere along the line I picked up a second Lenz system as well as a CVP Easy-DCC. I love the two cabs right there on the main control panel. Soon after that though they changed their wireless and my system was obsolete. They didn't really want to help upgrade just wanted to sell me a new system. They didn't seem to care I had been a loyal customer (still using the RailCommand system and all) for over two decades, so I parted company with them [CVP]. Otherwise Easy-DCC would have had my vote for favorite. I still think it is best, but customer care counts for a whole lot.
I do like the potential of the Lenz RailCom although I have not taken advantage of the technology, nor has hardly anyone else. Low hanging fruit, that might tip my decision toward them.
So I guess I have at least 10 command control systems. I have a hard time choosing between the Lenz and NCE-Pro cab. IF CVP still made wireless throttles for the Lenz I would say it wins, but they don't. So I voted for NCE. I also love the selection of NCE decoders (especially love the DASR and and buy them in bulk. Not all manufactures offer bulk discounts.