I 've been using a tweeked Maplenoll Ariadne signature for about 13 years with great results. I won't throw my hat in the ring with comparisons since I haven't done any controled test since th Maplenoll is an integrated unit. I will however throw in a little tweek that has worked very well for me in liu of an outer platter ring.
I made two little brass wire brackets kinda like an L shape with just a bit of a point extending out from the top to barely catch the record edge, the bottom leg going under the latter at a slight upward angle, and the vertical length sprung slightly and just over the height of the platter. With these I could clamp the record edge to the platter in two places if needs be. Definitely fiddley but cheap and effective. Email me at piedpiperprod@yahoo.com if you want to see pictures. Should work on most tables.
I made two little brass wire brackets kinda like an L shape with just a bit of a point extending out from the top to barely catch the record edge, the bottom leg going under the latter at a slight upward angle, and the vertical length sprung slightly and just over the height of the platter. With these I could clamp the record edge to the platter in two places if needs be. Definitely fiddley but cheap and effective. Email me at piedpiperprod@yahoo.com if you want to see pictures. Should work on most tables.