Yeah, impossible question to answer. Now, if you are looking for questions on best vintage, best value, most popular, etc., some more definitions on the question, then you would get some answers.
However this question, no matter how defined, is really going to be the opinion of the poster. In most cases, it will be a good opinion, but an opinion nonetheless. Plus the cartridge/tonearm has the most important impact on how a turntable sounds and there are as many, if not more, opinions on cartridges, as well as how a specific cartridge works with a specific arm/table.
I'll give you a couple names if you are looking for vintage. While not the best of the day, the AR and AR XA, are very popular vintage turntables, do little wrong and many things right. Also very easy to hot rod, should you wish. Thorens also made numerous models that are most collectors shelves or short lists of turntables they wish to have. While there are many better turntables, the two brands listed above are not uncommon and are usually available on Ebay at any time.