Good question and this forum will do as well as any. The Gamos are made in Spain, for the most part. The older 1250 (now Extreme?) is made in England. That's a very high powered break barrel gun. The Quest is Chinese. Some of the other Beemans, such as the dual caliber/barrel set sold in WalMart, are made in China, as well. The R series Beemans (R-7, R-9, R-1, etc) are made for Beeman by HW in Germany. As a result, their fit, finish and price are double or triple that of the Spanish/Chinese guns.
Which gun is best for you? Depends entirely upon what you want to do with it and, perhaps next, how much you are willing to spend. On the lower $ end, the Chinese guns are presently pretty good buys. Mike Milleck, who posts here, imports them and will give them a tune/inspection before shipping, which is much more than you will find almost anywhere. The Ruger Air Hawk is also a good buy. For a bit more you can get a Diana 34 (German break barrel) that is a great hunting/plinking gun and built to last. The new Panther synthetic stocked model is proving to be quite popular. As to Gamo, I'm not a fan of the Big Cat but, then, I don't have one to go by, either. I would rather spend a bit more and get a CFX underlever. Again, it all depends on your needs.
Oh, and don't forget there are other air guns besides springers. Benjamin Sheridan pump ups and the Benjamin Discovery pre-compressed air rifles, for example. So, what do you think you will be doing with an air rifle? That is where your shopping journey begins. But, be warned! Sometimes the air gun shopping journey is never-ending, especially if you get infected with air gun oil.