This is my 02cent. I have both and they are both very good in appearance. WG is definity one of the wettest/slickest LSP that I have tried (EX, DP, Zaino, einzett, UPP, DG). I use it on my black car that is outside 24/7. Its durability is definitly below avg., but it takes me no time to put another layer. I put three layers and maintain with DG AW. It has lasted two months so far.
Now DG 105/AW also is really deep and wet looking (similar to z2pro/z5 but slightly deeper imo. Mind you I have not used the z5pro). WG is slightly easier to apply and maybe more wet looking? That is real hard to tell, because sometimes it seems my burgundy/red car with 105/AW is more wet. Definitly much more durable than WG.
If you already have WG, just get the DG line and try it, very reasonable priced. I probably will switch to DG once my WG is empty.