Both are good
Don't fall into that "If it ain't a crown or a diamond, it ain't no good" way of thinking.
I have both in my room and have held Major Pro-ams on Gandy's before I had Crowns and had zero complaints.
I literally went 20 feet away and leaned over one of my Gandys to check on what another poster wrote and did not see any sign of the table shaking much less vibrating "excessively". I had to actually give it a good bump to see only the slightest of vibration.
I will say, however, that the crowns had virtually no shake at all. Unless you're 400 lbs, the Gandy will hold true providing there has been no abuse and misuse.
I will also agree that the price of one should be around $1200.00 to $1500.00 depending on the condition. If the condition is questionable on ANY table, that table should be avoided and your search should continue. Be sure to leave some room in your final offer for any repairs or alterations you may want or need to make.
If you end up paying in the range I mentioned, you won't have gotten robbed. You certainly could wait around for a Crown to come available, but who knows when that will be and if it will suit you.
Finally, keep in mind that, because the Gandy Corporation has gone out of business, not all parts are available from Aurora Road Billiards (800-940-2837) or anywhere else for that matter. In other words, you probably won't need parts, but if you do, you may not be able to get them. Good luck.
Gene