Ive got the SwissTool, Spirit and several Champs. They way I see it, they each fill a certain niche:
Champ - When you need more than a knife but do not want the heft of a multi-tool. These include - working on kids toys, computers, eyeglasses, tinkering with electronic devices, etc. The tools are very handy but are not hard use. The Champ is also great for camping.
Spirit - when you want a multi-tool but do not need the big heavy one tugging at your belt. I tend to carry the Spirit in my pocket around the house for light to medium duty chores - fixing things, tightening things, etc.
Swisstool - when you need a heavy duty tool and may be away from your toolbox. I carry this when I know I will be pulling, prying, etc. If I am out on my property doing work on the kids playset, fences, in the sheds, etc. I want the bigger tool.
IMHO they each have their place, but like the other post said - I would keep the Champ with me and keep the multi tool in a bag or glovebox.