No restored 124 are equal. Personally I heard the Swissonor’s 124 with a 200Volt tension and all the restored pieces they made for them and for Shopper.
Both Swissonor and Schopper know the 124 needs, among other good things, an electric tension lower than the new 230 or 240V used in Europe.
Also the new tonerarm made by Swissonor is a clear winner that has been made for the Thorens wonder.
With the new bearing and a motor that is completely dismantled, greased and some parts changed, (a 4 days work by a skilled technician) there is absolutely no rumble at all.
For me the best of the 3 I really know by a wide margin. As soon as I can I want to buy one but I also ask myself how and if a 930 EMT could compete (927 is out of budget for me).