I have a Wave that I bought as a lighter alternative to my SwissTool. After a month or so of use the Wave is sitting in a drawer and the SwissTool is back in my daypack.

The SwissTool just seems to be a lot sturdier. My Wave developed a little play (I admit very little) and felt a bit "wobly" after some (admitedly heavy) work. The SwissTool has been by my side for around five years and it shows no signs of wear.

The SwissTool Spirit would be my choice for a lighter multitool. It's built as strong as the original SwissTool but weighs a lot less and is more compact.

The only advantages I see in some Leatherman models are the one hand opening blades and the premium steels, but this features aren't really important for me because the least used tool in my multis are the knife blades. I alway have two other knives on me at all times.