In reply to AdCo82:
The Matterhorn is obviously the Big Daddy, for its isolation, sheer scale, and extraordinary rock architecture. Everyone I know who's done it, says the Zmutt Ridge, of it's type, is virtually without equal.
All the Valais/Pennine Alps are very fine, huge, isolated peaks (e.g The Dom, Dent Blanche, Weisshorn) and pretty much in a class of their own.
The Mont Blanc Massif is what it says. i huge grand mountain with lots of outliers. The Chamonix Aiguilles are a bunch of huge needles, most quite close together. But extraordinary (e.g the Grepon, and Dent du Requin fine and isolated) But there are some major separate summits such as the Verte, the Grandes Jorasses and the Chardonnay.
Bregaglia has a lot of very fine rock peaks, such as the Badile, which are almost in a class of their own for quality of rock and climbing.
In the Bernina, Piz Bernina is very fine.
In the Bernese Overland, all I know who have down the Finssteraarhorn rave about it.
The Eiger would just about get into this top list, but it's not very isolated, being part of a close-knit chain (Eiger-Monch-Jungfrau)
Dolomites as gigantic upscaled limestone skyscrapers are extraordinary. The Marmolada and the Tre Cime are particularly extraordinary,
After that, we get into the B team,
