Few points, first, they are similar enough to me that I would never think to change from one to the other. It would be almost a waste of time imo. You know that feeling you get when you buy something and you get it home only to realise its identical to something you already have!!!
Anyway, even though the two rings being similar, I dont like them equally. The second one has a weird angle on the halo that makes it almost like a donut to me. It reminds me of something that is trying very hard to be special. Whereas the first design has nice proportions. The halo is correctly proportioned around the centre diamond. It is balanced and looks very pretty and feminine. The second one looks too organic for my tastes. The first one looks more classical too.
I would LOVE to see your past changes, it sounds like you have been very busy.
I have had the same ring for 17 years and by sheer fluke, I chose a setting that I have never tired of, and that is rare indeed for me!!!!