I’ve owned all of those and they all have their plusses and minuses to my mind:
Lenco: still relatively affordable, beautifully simple and easy to work on, a great base for a DIY poject, but as-is the tonearm is agricultural at best. If you want it to really compete at the modern high-end you do need to modify/DIY to a fair degree.
Garrard 301/401: superb, muscular broadcast-grade decks. Now expensive, and large too once you have plinthed them appropriately and ideally partnered with a 12” arm. Expensive, but hold value well. Not as easy to work on as a Lenco, but stunning build quality and hugely reliable decks.
Thorens TD124: truly beautiful, capable, but (overly) complex design. By far the hardest to work on as the drive mechanism has a whole extra level of complexity due to being both belt and idler drive. There are many potential sources of noise in a TD-124! By saying that it is beautifully made and designed. The most ergonomically perfect deck ever made IMHO. Expensive, my favourite, but mainly down to looks, ergonomics, and a far more compact form-factor.
EMT 930, 927: Arguably the king of the heap. Plug and play broadcast decks. Cost a fortune in their day, cost a fortune today. Spectacular military-grade engineering. Now pretty much impossible to find a really good example for less than the price of a decent car. Which is rather annoying.
All these decks are capable of superb results if they are in perfect condition and appropriately serviced. I’d not even attempt to rank them as they are all different and all lend themselves to different contexts/solutions. No wrong answers, but do be prepared to learn and put some work in getting the best out of any of them.