SimonTheBeetle: And by the stat numbers I see from the Proshop, I can't tell which one suits me better. The more I look and try to analyze them, the more confused I get. :(
From this statement the conclusion might be correct that both sets would fit you equally well(?)
My two Pfennig:
To me, the main playing difference is the spacing: 50 - 75 - 100 for ATV, 60 - 80 - 100 for 588. Therefore, and combined with the punch shots and all the others, the ATV cover a broader range of full scale shots. They share the same meter speed, therefore it's easy to mix them as I do: Z-Satin 50, ATV 75, CG16 100 yards.
Historically, the Cleves (meaning, their predecessors CG16) once were the only top wedges in the Pro Shop. Lateron, they remained the most favourised wedges in WGTland. At that time they were praised for their stopping ability, and they were cheaper than the ATVs, much cheaper than those 588s of today.
Today, me thinks that the new Cleves are a luxury produce with three disadvantages: spacing, price, level. Of course, they are advantageous if you are facing those shots, but these details are beyond me.