Grand Lizard. I only owned it for about a year. But in that year it was in my bedroom, so I played it a LOT (almost every night). A friend of mine was selling his Team One, and the guy wanted more machines to make it worth his drive, so my buddy asked me. I was thinking of selling my X's & O's, so I offered that up and he was going to take it. And then he asked for more, and I added in GL, because I'm dumb. He picked up my friends Team One, and then both of my games. In the years since then I've played GL a few times, and loved it every time.
The bummer right now is that two of them just came up for sale in Pennsylvania. In "normal" times, I would have driven down there already and bought the better one. But these are not normal times. At some point in the future, I'll own another one.