Both are possibly fine turntables. The Thorens is probably an easier table to deal with -- maybe. Thorens are common, easy to find parts for, have a quiet belt drive system and a reasonable arm. The suspension system is effective for acoutstic feedback, but in the wrong place in the room, will skip when ever you walk. The Lenco has an arm that probably needs its weird and misconcieved rubber pivot bearings replaced, and the decoupling of the counterweight is prone to catastrophic and unrepairable failure. So the arm probably should be replaced (and maybe already has been). And the suspension is sort of rudimentary. And the idlers can get hard and noisy. If you are willing to replace the arm and mount the table in a high mass plinth,a nd it ahs a good idler, there is something about idler drives and the their pace rhythym and timeing that is pretty compelling. Talk about deep tactile bass...
So the Thorens is a very good reliable table, but the Lenco is potentially a super table, though only if you spend a good deal of time and effort, and possibly a fair amount of money. You would probably be happy with either, but some people will consider one option obvious and the other ridiculous, while other people will come to the opposite conclusion. It depends who you are...