Personally, I don't think there is a definative best between the Marbles and Lymans. Marbles adjust for W & E, Lyman for Elevation only thus requiring some shimming of base or moving of the foresight. The Marble is bulkier and the Lyman trimmer and that can make some difference on your thumb position along the tang. Marbles are more expensive for the advantage of adjusting windage.
If I don't use an aperture receiver sight, I generally put Marbles on my hunting guns to facilitate zero and it's a toss up for CAS with it's more "generous" accuracy requirements. Personally, I wouldn't look at any of the cheaper Euro versions of the old tangs and would stick with Marble or Lyman, but that's my preference. A couple of the Euro copies I acquired I immediately swapped out since they didn't have enough tension to remain upright for my taste. Have heard some QC problems with Marble AND Lyman, but the dozen or so that I personally have mounted on using guns (probably a few more Marbles than Lymans) have proven good, reliable sights. Half of those are period sights to fit the weapons rather than current production.
None of the current sights are made as well in my judgement as the older versions, but I wouldn't personally spend the money for the older versions on clones. I do use the originals on early 94's and 92's and appropriate period apertures on my 71's. Put Marbles on my Browning 1886 and 92's and saved an original Beach Foresight for use on an original WInchester on the odd chance I ever find one in the condition I want at a price I can afford.
Just one perspective on the issue. Hope it's useful.
