[raulus]

Why not both!?

Aside from the fact that they'll set you back a pretty penny, that is.

Part of the fun with working on a couple of different sets at the same time is that you're unlikely to stall out and get bored for too long, particularly with these sets since the print runs were so large and they are so actively traded today. Even if you're picky and excessively deliberate in your approach, you should have plenty of options for fussing over the details while you carefully make your selections for each piece.

Of course, if you're working on a relatively limited budget and time is a factor, then you're better off just picking one. But barring that, my vote would be for both.