I've worked as a sales consultant for Brunswick, played for a living for a pretty good portion of my life, and worked as a table mechanic, I feel like I have a fairly good understanding of both tables. As far as where/how they are made: the Brunswick GCV does have the woodworking done in Asia, the slate is from Italy or South America (as are basically all slates for every company) unless something drastic has changed in the last couple of years, and comes in small boxes to be assembled on-site. The diamond is manufactured in the U.S. as a premanufactured cabinet (one-piece), some of the basic advantages and disadvantages are that the Diamond is fairly idiot proof as far as levelling, but more difficult to get parts, it's not unusual for some of the leg veneers to pop off when flipping the Diamond over if moving in a table dolly (I mean for the average people who DIY), and the fact that it comes as a single cabinet makes replacement if anything goes wrong or bad a little more of a pain. The GC is more labor intensive to set up or move, as it comes in a ton of boxes, and is a little more difficult to level, even with the levelling system. As stated before, the new blue label diamonds are light years better than the red labels, but for my money the Brunswick Super Speed rails are the best that have ever been made, but that's a personal opinion, I think they are more consistent, but that's just me. Both tables have extremely durable top rails, should last forever, and are warrantied (unless diamond has changed fairly recently, while I've been to Diamond it's been years, my personal experience with Brunswick is much more involved) for life, I know the GC was the only table that was warrantied even if put in pool halls, this might not be the case anymore, I don't know. If you go the Diamond route, I (and basically every serious player I've ever met lol) would recommend changing the balls out immediately. The Cyclops balls are nothing short of terrible, between them and going to the super cheap plastic rack diamond has taken cost cutting to the extreme with the ancillary items. I still love the Centennial balls, but they're basically the same as the Super Pro line, and yes, aramith makes both. Just don't get a great table and crappy balls, it's similar to buying a Ferrari and using retread tires. As for price, don't let the "list" prices fool you, although the GC is listed at 10k that's not what you'll actually pay, a little research will show the range they actually sell for, I would tell you but I'm not sure, I know when I was selling them it was usually about 25-30% below the MSRP depending on where you bought it from. For playability, the two biggest differences have always been the rail and the pocket shelf, while diamond has closed the gap on the rails with the blue labels I still prefer the GC myself, but the pocket shelves on the diamonds are still much deeper, which means gravity on bobbled balls cant take effect, hence the diamonds play tighter. I personally think a stock GC has pockets that play too big, and for mw even the "tournament cut" pockets on the GC are a little too loose (in fairness I don't think the pro-cut diamonds were tight enough either). This can be remedied with rail extensions or shims, but it is an extra expense if you want tighter pockets. Another check mark for the diamond is that most major events are now played on diamonds, such as Derby, the Open, etc (Brunswick doesn't focus much on advertising or publicity in the U.S. anymore, so Diamond has smartly snapped up a lot of those opportunities). Basically they are both great tables, I haven't played much on the Gabriels, but I've heard they are the only other table that I've heard compares to the two you mentioned, I don't think you can go wrong with either, it's honestly more of a preference between the two. I would recommend looking into why you want it. If it's for furniture the GC has more options, if you're an extremely serious player and plan on going to Derby or the Open the Diamond would likely be a better choice. I'm sure I've forgotten several things, but this is stupid long as it is lol. Hope this book helps!