which is the better suspension?

[ej_saiyajin4]

which is better double wishbone or macpherson?

[mbeige]

Better for what?

Handling - double wishbone (multi-link suspension is probably best)
Ease of maintenance - McPherson strut (one less control arm to maintain)

Check this out http://www.carbibles.com/suspension_bible.html

[niky]

Better is relative. The double wishbone is inherently superior, because of the way it can execute camber and toe changes in corners, but a McPherson-strut car can be made to handle almost as well as a double-wishbone car. The main advantage of McPherson systems is simplicity and low weight.

The Civic was widely held to be one of the best handling front-wheel drive "commuter" cars of its time thanks to the double-wishbone setup. But other cars with McPhersons handle nearly as well or just as well. The Mazda Famila/Protege/Ford Lynx, for example, which use clever rear suspension geometry on their rear McPhersons (with trailing links) for improved handling, or, even better, the new Honda Fit/Jazz, which manages to drive very well despite having one of the worst possible suspension set-ups from a technical standpoint... front McPhersons and a rear beam axle suspension. Seems Honda got around the problems with rear beams by adding a good amount of toe-in under squat.

But of course, all of this is relative and dependent on the car. For daily cars, McPhersons aren't a big handicap. But if you're making a sportscar and don't need the space-saving that McPhersons give, double-wishbone is the way to go.

[Type 100]

Which design is better? Neither.

It's all in the tuning. You can waste a perfectly good double-wishbone setup with ridiculous damper and spring rates.