These are referred to as Sausage and sandwich...
Quality really comes down to who did the lume...I have not seen any deteriorate during the rep life to any degree but generally the current rule of thumb is the latest rep lume is pretty damn good if you go for older versions then get them redone by modders.
Lates versions of 177L, 219L, 005K, 318 and DLs, 288 212 253 etc
Theses dials are variations to models or series....ie a PAM 111 E to G is sausage after that its sandwich etc etc
I suggest you research models you like before you worry about quality of lume or you will spend the next few years trying to decide
Once you have a few then you can get recommendations and make your choice